diff --git a/lib/services/lastheard_websocket_client.dart b/lib/services/lastheard_websocket_client.dart
index 0cd5a4c..5f74663 100644
--- a/lib/services/lastheard_websocket_client.dart
+++ b/lib/services/lastheard_websocket_client.dart
@@ -15,8 +15,14 @@ class LastHeardWebSocketClient {
   static const int _maxReconnectAttempts = 5;
   static const Duration _reconnectDelay = Duration(seconds: 5);
 
+  final List<int>? _radioIds;
+  int _receivedCount = 0;
+  static const int _maxItems = 200;
+
   final Completer<void> _readyCompleter = Completer<void>();
 
+  LastHeardWebSocketClient({List<int>? radioIds}) : _radioIds = radioIds;
+
   // Socket.IO Engine.IO v4 WebSocket URL for Last Heard
   static const String _wsUrl =
       'wss://api.brandmeister.network/lh/?EIO=4&transport=websocket';
@@ -37,7 +43,8 @@ class LastHeardWebSocketClient {
     }
 
     _isConnecting = true;
-    _shouldReconnect = true;
+    // Don't reconnect if radio IDs are supplied (one-time search query)
+    _shouldReconnect = _radioIds == null || _radioIds.isEmpty;
 
     try {
       debugPrint('LastHeard WS: Connecting to $_wsUrl');
@@ -71,7 +78,7 @@ class LastHeardWebSocketClient {
         _handleOpenPacket(messageStr);
       } else if (messageStr.startsWith('2')) {
         _sendPong();
-      } else if (messageStr == '40') {
+      } else if (messageStr.startsWith('40')) {
         _handleNamespaceConnect();
       } else if (messageStr.startsWith('42')) {
         _handleDataPacket(messageStr);
@@ -133,11 +140,20 @@ class LastHeardWebSocketClient {
       return;
     }
 
+    if (_radioIds == null || _radioIds.isEmpty) {
+      debugPrint('LastHeard WS: No radio IDs provided, skipping search query');
+      return;
+    }
+
     try {
+      // Build SQL query for multiple radio IDs: SourceID = 123 OR SourceID = 456
+      final sqlParts = _radioIds.map((id) => 'SourceID = $id').toList();
+      final sql = sqlParts.join(' OR ');
+
       final message = '42${jsonEncode([
             'searchMongo',
             {
-              'query': {'sql': ''},
+              'query': {'sql': sql},
               'amount': 200
             }
           ])}';
@@ -180,6 +196,15 @@ class LastHeardWebSocketClient {
           _messageController != null &&
           !_messageController!.isClosed) {
         _messageController!.add(eventData);
+
+        // Track received items and disconnect after receiving max items (for search queries)
+        if (_radioIds != null && _radioIds.isNotEmpty) {
+          _receivedCount++;
+          if (_receivedCount >= _maxItems) {
+            debugPrint('LastHeard WS: Received $_maxItems items, disconnecting');
+            disconnect();
+          }
+        }
       }
     } catch (e) {
       debugPrint('LastHeard WS: Error parsing data packet: $e');
diff --git a/lib/views/device_detail_view.dart b/lib/views/device_detail_view.dart
index c43f14d..130bfd4 100644
--- a/lib/views/device_detail_view.dart
+++ b/lib/views/device_detail_view.dart
@@ -500,7 +500,7 @@ class _DeviceDetailViewState extends State<DeviceDetailView> {
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: [
               Text(
-                'Last Heard on Talkgroup',
+                'Last Activity on Talkgroup',
                 style: Theme.of(context).textTheme.titleLarge?.copyWith(
                       fontWeight: FontWeight.bold,
                     ),
diff --git a/lib/views/last_heard_view.dart b/lib/views/last_heard_view.dart
index f57a62a..6cff27f 100644
--- a/lib/views/last_heard_view.dart
+++ b/lib/views/last_heard_view.dart
@@ -1,7 +1,9 @@
 import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 import '../models/last_heard_item.dart';
+import '../services/authentication_manager.dart';
 import '../services/lastheard_websocket_client.dart';
 
 class LastHeardView extends StatefulWidget {
@@ -36,7 +38,11 @@ class _LastHeardViewState extends State<LastHeardView> {
       _isConnecting = true;
     });
 
-    _wsClient = LastHeardWebSocketClient();
+    final authManager = context.read<AuthenticationManager>();
+    final devices = await authManager.getDevices();
+    final radioIds = devices.map((d) => d.id).toList();
+
+    _wsClient = LastHeardWebSocketClient(radioIds: radioIds);
     await _wsClient!.connect();
 
     _wsSubscription = _wsClient!.messageStream.listen((message) {
@@ -53,7 +59,7 @@ class _LastHeardViewState extends State<LastHeardView> {
   void _handleMqttMessage(Map<String, dynamic> data) {
     try {
       final topic = data['topic'] as String?;
-      if (topic == 'LH') {
+      if (topic == 'LH-Startup') {
         final payloadStr = data['payload'] as String?;
         if (payloadStr != null) {
           final payload = jsonDecode(payloadStr) as Map<String, dynamic>;
@@ -84,21 +90,7 @@ class _LastHeardViewState extends State<LastHeardView> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('Last Heard'),
-        actions: [
-          if (_items.isNotEmpty)
-            Padding(
-              padding: const EdgeInsets.only(right: 16),
-              child: Center(
-                child: Text(
-                  '${_items.length} ${_items.length == 1 ? "entry" : "entries"}',
-                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                        color: Theme.of(context).colorScheme.onPrimaryContainer,
-                      ),
-                ),
-              ),
-            ),
-        ],
+        title: const Text('Last Activity'),
       ),
       body: _buildBody(),
     );
@@ -112,7 +104,7 @@ class _LastHeardViewState extends State<LastHeardView> {
           children: [
             CircularProgressIndicator(),
             SizedBox(height: 16),
-            Text('Connecting to Last Heard...'),
+            Text('Connecting to Last Activity...'),
           ],
         ),
       );
@@ -135,7 +127,7 @@ class _LastHeardViewState extends State<LastHeardView> {
             ),
             const SizedBox(height: 8),
             Text(
-              'Waiting for Last Heard data...',
+              'Waiting for Last Activity data...',
               style: TextStyle(color: Colors.grey[600]),
             ),
           ],
diff --git a/lib/views/main_view.dart b/lib/views/main_view.dart
index 97b1591..852530e 100644
--- a/lib/views/main_view.dart
+++ b/lib/views/main_view.dart
@@ -40,7 +40,7 @@ class _MainViewState extends State<MainView> {
           ),
           BottomNavigationBarItem(
             icon: Icon(Icons.history),
-            label: 'Last Heard',
+            label: 'Last Activity',
           ),
           BottomNavigationBarItem(
             icon: Icon(Icons.more_horiz),