HF communications are still a crucial part of military communications. Here are some frequencies worth monitoring as tensions rise in Ukraine. (Data provided by Pyriom.) WESTERN MILITARY DISTRICT The Buzzer (4625 kHz) D marker (5292 kHz)T marker (4182 kHz) The Air Horn (3510 kHz)The Goose (4310/3243 kHz) The Alarm (4770 […]