This app is a companion to the HamAlert web site (hamalert.org) and lets you receive push notifications from HamAlert. HamAlert is a system that allows amateur radio operators to get notifications when a desired station appears on the Reverse Beacon Network, SOTAwatch or the DX cluster. Spots can be filtered by various criteria, including: DXCC (both actual and callsign home DXCC). Callsign. SOTA summit reference. CQ zone. Continent. Band. Mode. Time and days of week. Source. Spotter callsign and DXCC.