diff --git a/lib/microwaveprop/pskr.ex b/lib/microwaveprop/pskr.ex
index 0357fae8..8e3bb0bb 100644
--- a/lib/microwaveprop/pskr.ex
+++ b/lib/microwaveprop/pskr.ex
@@ -58,6 +58,8 @@ defmodule Microwaveprop.Pskr do
           transmit_time: DateTime.t(),
           sender_grid: String.t(),
           receiver_grid: String.t(),
+          sender_callsign: String.t() | nil,
+          receiver_callsign: String.t() | nil,
           sender_country: integer() | nil,
           receiver_country: integer() | nil
         }
@@ -89,6 +91,8 @@ defmodule Microwaveprop.Pskr do
          transmit_time: transmit_time,
          sender_grid: sender_grid,
          receiver_grid: receiver_grid,
+         sender_callsign: normalize_callsign(Map.get(json, "sc")),
+         receiver_callsign: normalize_callsign(Map.get(json, "rc")),
          sender_country: Map.get(json, "sa"),
          receiver_country: Map.get(json, "ra")
        }}
@@ -135,6 +139,8 @@ defmodule Microwaveprop.Pskr do
       max_snr_db: spot.snr_db,
       min_snr_db: spot.snr_db,
       modes: maybe_mode_list(spot.mode),
+      sender_callsigns: maybe_callsign_list(spot.sender_callsign),
+      receiver_callsigns: maybe_callsign_list(spot.receiver_callsign),
       first_spot_at: spot.transmit_time,
       last_spot_at: spot.transmit_time
     }
@@ -147,6 +153,8 @@ defmodule Microwaveprop.Pskr do
         max_snr_db: max_snr(acc.max_snr_db, spot.snr_db),
         min_snr_db: min_snr(acc.min_snr_db, spot.snr_db),
         modes: add_mode(acc.modes, spot.mode),
+        sender_callsigns: add_callsign(acc.sender_callsigns, spot.sender_callsign),
+        receiver_callsigns: add_callsign(acc.receiver_callsigns, spot.receiver_callsign),
         first_spot_at: earliest(acc.first_spot_at, spot.transmit_time),
         last_spot_at: latest(acc.last_spot_at, spot.transmit_time)
     }
@@ -206,6 +214,16 @@ defmodule Microwaveprop.Pskr do
   defp add_mode(modes, nil), do: modes
   defp add_mode(modes, mode), do: if(mode in modes, do: modes, else: [mode | modes])
 
+  defp normalize_callsign(nil), do: nil
+  defp normalize_callsign(""), do: nil
+  defp normalize_callsign(call), do: String.upcase(call)
+
+  defp maybe_callsign_list(nil), do: []
+  defp maybe_callsign_list(call), do: [call]
+
+  defp add_callsign(calls, nil), do: calls
+  defp add_callsign(calls, call), do: if(call in calls, do: calls, else: [call | calls])
+
   defp max_snr(nil, b), do: b
   defp max_snr(a, nil), do: a
   defp max_snr(a, b), do: max(a, b)
diff --git a/lib/microwaveprop/pskr/aggregator.ex b/lib/microwaveprop/pskr/aggregator.ex
index c154ad43..2f550e63 100644
--- a/lib/microwaveprop/pskr/aggregator.ex
+++ b/lib/microwaveprop/pskr/aggregator.ex
@@ -122,6 +122,10 @@ defmodule Microwaveprop.Pskr.Aggregator do
                 max_snr_db: fragment("GREATEST(?, EXCLUDED.max_snr_db)", s.max_snr_db),
                 min_snr_db: fragment("LEAST(?, EXCLUDED.min_snr_db)", s.min_snr_db),
                 modes: fragment("ARRAY(SELECT DISTINCT unnest(? || EXCLUDED.modes))", s.modes),
+                sender_callsigns:
+                  fragment("ARRAY(SELECT DISTINCT unnest(? || EXCLUDED.sender_callsigns))", s.sender_callsigns),
+                receiver_callsigns:
+                  fragment("ARRAY(SELECT DISTINCT unnest(? || EXCLUDED.receiver_callsigns))", s.receiver_callsigns),
                 first_spot_at: fragment("LEAST(?, EXCLUDED.first_spot_at)", s.first_spot_at),
                 last_spot_at: fragment("GREATEST(?, EXCLUDED.last_spot_at)", s.last_spot_at),
                 updated_at: fragment("EXCLUDED.updated_at")
diff --git a/lib/microwaveprop/pskr/spot_hourly.ex b/lib/microwaveprop/pskr/spot_hourly.ex
index e2c828ce..8044af8a 100644
--- a/lib/microwaveprop/pskr/spot_hourly.ex
+++ b/lib/microwaveprop/pskr/spot_hourly.ex
@@ -46,6 +46,8 @@ defmodule Microwaveprop.Pskr.SpotHourly do
     field :max_snr_db, :integer
     field :min_snr_db, :integer
     field :modes, {:array, :string}, default: []
+    field :sender_callsigns, {:array, :string}, default: []
+    field :receiver_callsigns, {:array, :string}, default: []
     field :first_spot_at, :utc_datetime
     field :last_spot_at, :utc_datetime
 
@@ -56,8 +58,8 @@ defmodule Microwaveprop.Pskr.SpotHourly do
 
   @cast_fields ~w(hour_utc band sender_grid receiver_grid sender_country receiver_country
                   sender_lat sender_lon receiver_lat receiver_lon midpoint_lat midpoint_lon
-                  distance_km spot_count max_snr_db min_snr_db modes first_spot_at
-                  last_spot_at)a
+                  distance_km spot_count max_snr_db min_snr_db modes sender_callsigns
+                  receiver_callsigns first_spot_at last_spot_at)a
 
   @required_fields ~w(hour_utc band sender_grid receiver_grid spot_count)a
 
diff --git a/lib/microwaveprop_web/live/pskr_spots_live.ex b/lib/microwaveprop_web/live/pskr_spots_live.ex
index 7712f18a..44657901 100644
--- a/lib/microwaveprop_web/live/pskr_spots_live.ex
+++ b/lib/microwaveprop_web/live/pskr_spots_live.ex
@@ -35,22 +35,27 @@ defmodule MicrowavepropWeb.PskrSpotsLive do
   defp fmt_snr(min, max) when min == max, do: "#{min} dB"
   defp fmt_snr(min, max), do: "#{min}–#{max} dB"
 
+  defp fmt_callsigns([]), do: "—"
+  defp fmt_callsigns(calls), do: Enum.join(calls, ", ")
+
   @impl true
   def render(assigns) do
     ~H"""
-    <Layouts.app flash={@flash} current_scope={@current_scope}>
+    <Layouts.app flash={@flash} current_scope={@current_scope} max_width="max-w-none">
       <.header>
         PSK Reporter Spots
         <:subtitle>Last {@limit} spot aggregates from the MQTT firehose</:subtitle>
       </.header>
 
-      <div class="overflow-x-auto -mx-2 px-2">
+      <div class="overflow-x-auto">
         <table class="table table-sm table-zebra whitespace-nowrap">
           <thead>
             <tr>
               <th>Last Heard (UTC)</th>
               <th>Band</th>
+              <th>From</th>
               <th>From Grid</th>
+              <th>To</th>
               <th>To Grid</th>
               <th>Distance</th>
               <th class="text-right">Spots</th>
@@ -63,7 +68,13 @@ defmodule MicrowavepropWeb.PskrSpotsLive do
               <tr>
                 <td class="text-xs font-mono">{fmt_dt(spot.last_spot_at)}</td>
                 <td class="text-xs"><span class="badge badge-sm">{spot.band}</span></td>
+                <td class="text-xs font-mono whitespace-nowrap">
+                  {fmt_callsigns(spot.sender_callsigns)}
+                </td>
                 <td class="text-xs font-mono">{spot.sender_grid}</td>
+                <td class="text-xs font-mono whitespace-nowrap">
+                  {fmt_callsigns(spot.receiver_callsigns)}
+                </td>
                 <td class="text-xs font-mono">{spot.receiver_grid}</td>
                 <td class="text-xs font-mono">{Format.distance_km(spot.distance_km)}</td>
                 <td class="text-xs text-right font-mono">{Format.number(spot.spot_count)}</td>
diff --git a/priv/repo/migrations/20260715192512_add_callsigns_to_pskr_spots_hourly.exs b/priv/repo/migrations/20260715192512_add_callsigns_to_pskr_spots_hourly.exs
new file mode 100644
index 00000000..6288d8f9
--- /dev/null
+++ b/priv/repo/migrations/20260715192512_add_callsigns_to_pskr_spots_hourly.exs
@@ -0,0 +1,10 @@
+defmodule Microwaveprop.Repo.Migrations.AddCallsignsToPskrSpotsHourly do
+  use Ecto.Migration
+
+  def change do
+    alter table(:pskr_spots_hourly) do
+      add :sender_callsigns, {:array, :string}, null: false, default: []
+      add :receiver_callsigns, {:array, :string}, null: false, default: []
+    end
+  end
+end
diff --git a/test/microwaveprop/pskr_test.exs b/test/microwaveprop/pskr_test.exs
index fd03dfd1..767a7c0a 100644
--- a/test/microwaveprop/pskr_test.exs
+++ b/test/microwaveprop/pskr_test.exs
@@ -30,6 +30,8 @@ defmodule Microwaveprop.PskrTest do
       assert spot.snr_db == -5
       assert spot.sender_grid == "EM12KL"
       assert spot.receiver_grid == "DM43ST"
+      assert spot.sender_callsign == "K5ABC"
+      assert spot.receiver_callsign == "K7XYZ"
       assert spot.sender_country == 291
       assert spot.receiver_country == 291
       assert %DateTime{} = spot.transmit_time
@@ -173,4 +175,61 @@ defmodule Microwaveprop.PskrTest do
       assert acc.modes == ["FT8"]
     end
   end
+
+  describe "callsign tracking" do
+    test "collects unique sender and receiver callsigns across merges" do
+      {:ok, s1} = Pskr.parse_spot(Jason.encode!(@sample))
+      {:ok, s2} = Pskr.parse_spot(Jason.encode!(%{@sample | "sc" => "K5DEF", "rp" => -3}))
+
+      acc =
+        nil
+        |> Pskr.merge_spot(s1)
+        |> Pskr.merge_spot(s2)
+
+      assert Enum.sort(acc.sender_callsigns) == ["K5ABC", "K5DEF"]
+      assert acc.receiver_callsigns == ["K7XYZ"]
+      assert acc.spot_count == 2
+    end
+
+    test "does not add duplicate callsigns" do
+      {:ok, s1} = Pskr.parse_spot(Jason.encode!(@sample))
+      {:ok, s2} = Pskr.parse_spot(Jason.encode!(%{@sample | "rp" => -3}))
+
+      acc =
+        nil
+        |> Pskr.merge_spot(s1)
+        |> Pskr.merge_spot(s2)
+
+      assert acc.sender_callsigns == ["K5ABC"]
+      assert acc.receiver_callsigns == ["K7XYZ"]
+    end
+
+    test "handles nil and empty callsigns in payload" do
+      nil_call = @sample |> Map.put("sc", nil) |> Jason.encode!()
+      {:ok, s_nil} = Pskr.parse_spot(nil_call)
+      assert s_nil.sender_callsign == nil
+
+      empty_call = @sample |> Map.put("sc", "") |> Jason.encode!()
+      {:ok, s_empty} = Pskr.parse_spot(empty_call)
+      assert s_empty.sender_callsign == nil
+
+      acc = nil |> Pskr.merge_spot(s_nil) |> Pskr.merge_spot(s_empty)
+      assert acc.sender_callsigns == []
+    end
+
+    test "uppercases callsigns from payload" do
+      json = @sample |> Map.merge(%{"sc" => "k5abc", "rc" => "k7xyz"}) |> Jason.encode!()
+      {:ok, spot} = Pskr.parse_spot(json)
+      assert spot.sender_callsign == "K5ABC"
+      assert spot.receiver_callsign == "K7XYZ"
+    end
+
+    test "initializes callsign arrays from first spot" do
+      {:ok, spot} = Pskr.parse_spot(Jason.encode!(@sample))
+      acc = Pskr.merge_spot(nil, spot)
+
+      assert acc.sender_callsigns == ["K5ABC"]
+      assert acc.receiver_callsigns == ["K7XYZ"]
+    end
+  end
 end
diff --git a/test/microwaveprop_web/live/pskr_spots_live_test.exs b/test/microwaveprop_web/live/pskr_spots_live_test.exs
index 2efbcf1c..0dc66368 100644
--- a/test/microwaveprop_web/live/pskr_spots_live_test.exs
+++ b/test/microwaveprop_web/live/pskr_spots_live_test.exs
@@ -25,10 +25,11 @@ defmodule MicrowavepropWeb.PskrSpotsLiveTest do
         (id, hour_utc, band, sender_grid, receiver_grid,
          sender_lat, sender_lon, receiver_lat, receiver_lon,
          distance_km, spot_count, max_snr_db, min_snr_db,
-         modes, first_spot_at, last_spot_at,
+         modes, sender_callsigns, receiver_callsigns,
+         first_spot_at, last_spot_at,
          inserted_at, updated_at)
       VALUES
-        ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $17)
+        ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $19)
       """,
       [
         dump_uuid(),
@@ -45,6 +46,8 @@ defmodule MicrowavepropWeb.PskrSpotsLiveTest do
         Map.get(fields, :max_snr_db, 5),
         Map.get(fields, :min_snr_db, 0),
         Map.get(fields, :modes, ["FT8"]),
+        Map.get(fields, :sender_callsigns, []),
+        Map.get(fields, :receiver_callsigns, []),
         Map.get(fields, :first_spot_at, fields.hour_utc),
         Map.get(fields, :last_spot_at, fields.hour_utc)
       ]
@@ -104,6 +107,31 @@ defmodule MicrowavepropWeb.PskrSpotsLiveTest do
       refute html =~ "3–3 dB"
     end
 
+    test "displays sender and receiver callsigns", %{conn: conn} do
+      insert_spot(%{sender_callsigns: ["K5ABC"], receiver_callsigns: ["K7XYZ"]})
+
+      {:ok, _lv, html} = live(conn, ~p"/pskreporter")
+
+      assert html =~ "K5ABC"
+      assert html =~ "K7XYZ"
+    end
+
+    test "displays multiple callsigns comma-separated", %{conn: conn} do
+      insert_spot(%{sender_callsigns: ["K5ABC", "W1AW"], receiver_callsigns: ["K7XYZ"]})
+
+      {:ok, _lv, html} = live(conn, ~p"/pskreporter")
+
+      assert html =~ "K5ABC, W1AW"
+    end
+
+    test "shows dash for empty callsigns", %{conn: conn} do
+      insert_spot(%{sender_callsigns: [], receiver_callsigns: []})
+
+      {:ok, _lv, html} = live(conn, ~p"/pskreporter")
+
+      assert html =~ "—"
+    end
+
     test "displays modes", %{conn: conn} do
       insert_spot(%{modes: ["FT8", "FT4"]})