diff --git a/webassets/js/spots.js b/webassets/js/spots.js
index 4edcc16..d969a01 100644
--- a/webassets/js/spots.js
+++ b/webassets/js/spots.js
@@ -1,5 +1,6 @@
 // SSE event source
 let evtSource;
+let restartSSEOnErrorTimeoutId;
 // Table row count, to alternate shading
 let rowCount = 0;
 
@@ -30,6 +31,9 @@ function loadSpots() {
 // Start an SSE connection (closing an existing one if it exists). This will then be used to add to the table on the
 // fly.
 function startSSEConnection() {
+    if (evtSource != null) {
+        evtSource.close();
+    }
     evtSource = new EventSource('/api/v1/spots/stream' + buildQueryString());
 
     evtSource.onmessage = function(event) {
@@ -66,8 +70,11 @@ function startSSEConnection() {
     };
 
     evtSource.onerror = function(err) {
-        evtSource.close();
-        setTimeout(startSSEConnection, 1000);
+        if (evtSource != null) {
+            evtSource.close();
+        }
+        clearTimeout(restartSSEOnErrorTimeoutId)
+        restartSSEOnErrorTimeoutId = setTimeout(startSSEConnection, 1000);
     };
 }
 
diff --git a/webassets/js/spotsbandsandmap.js b/webassets/js/spotsbandsandmap.js
index 5a8e1cd..4445592 100644
--- a/webassets/js/spotsbandsandmap.js
+++ b/webassets/js/spotsbandsandmap.js
@@ -23,8 +23,18 @@ function generateBandsMultiToggleFilterCard(band_options) {
         var cssFormattedBandName = o['name'] ? o['name'].replace('.', 'p') : "unknown";
         $("#band-options").append(`<input type="checkbox" class="btn-check filter-button-band storeable-checkbox" name="options" id="filter-button-band-${cssFormattedBandName}" value="${o['name']}" autocomplete="off" onClick="filtersUpdated()" checked><label class="btn btn-outline" id="filter-button-label-band-${cssFormattedBandName}" for="filter-button-band-${cssFormattedBandName}">${o['name']}</label> `);
     });
-    // Create All/None buttons
-    $("#band-options").append(` <span style="display: inline-block"><button id="filter-button-band-all" type="button" class="btn btn-outline-secondary" onclick="toggleFilterButtons('band', true);">All</button>&nbsp;<button id="filter-button-band-none" type="button" class="btn btn-outline-secondary" onclick="toggleFilterButtons('band', false);">None</button></span>`);
+    // Create All/None/Ham HF buttons
+    $("#band-options").append(` <span style="display: inline-block"><button id="filter-button-band-all" type="button" class="btn btn-outline-secondary" onclick="toggleFilterButtons('band', true);">All</button> <button id="filter-button-band-none" type="button" class="btn btn-outline-secondary" onclick="toggleFilterButtons('band', false);">None</button> <button id="filter-button-band-none" type="button" class="btn btn-outline-secondary" onclick="setHamHFBandToggles();">Ham HF</button></span>`);
+}
+
+// Set the band toggles so that only the amateur radio HF bands are selected. This includes 160m and 6m because that's
+// widely expected by hams to be included. Special case of toggleFilterButtons().
+function setHamHFBandToggles() {
+    const hamHFBands = ["160m", "80m", "60m", "40m", "30m", "20m", "17m", "15m", "12m", "10m", "6m"];
+    $(".filter-button-band").each(function() {
+        $(this).prop('checked', hamHFBands.includes($(this).attr('id').replace("filter-button-band-", "")));
+    });
+    filtersUpdated();
 }
 
 // Generate SIGs filter card. This one is also a special case.