I spent two nights monitoring the US Air Force radio transmissions and also making a few ham radio contacts from a glorious new location. The High Frequency Global Communications System (HFGCS) is a network of single sideband shortwave transmitters of the United States Air Force which is used to communicate with aircraft in flight, ground stations and some United States Navy surface assets. All worldwide receiving and transmitting sites in the HFGCS system are remotely controlled from Andrews Air Force Base and Grand Forks Air Force Base. Before 1 October 2002 it was known as the Global High Frequency System (GHFS). The primary HFGCS voice frequencies are 4724.0 kHz, 8992.0 kHz, 11175.0 kHz, and 15016.0 kHz. In addition to the HFGCS, U.S. aircraft frequently use Military Auxiliary Radio System (MARS) HF stations (13927.0 kHz) and Canadian Forces HF stations (11232.0 kHz) to relay messages. One common use for the HFGCS is to place telephone calls from the aircraft in flight by means of the Defence Switched Network (DSN) to an U.S. Air Force base. The HFGCS also carries Emergency Action Messages (EAMs). (Info from Wikipedia) https://en.wikipedia.org/wiki/High_Frequency_Global_Communications_System Other useful sites: https://priyom.org/military-stations/united-states/hfgcs http://mt-milcom.blogspot.com/ The location for the overnight stay was Mount Pleasant Camping and Glamping: http://mountpleasantglamping.co.uk/