While I was out walking the dogs today, I noticed that GB3GD is back in service.
GB3GD is the callsign of an amateur radio VHF repeater, based on the summit of Snaefell on the Isle of Man. A repeater is a radio receiver and transmitter combined (with some control logic too) that takes weak signals from handheld or mobile radios, and retransmits them over a wider area.
Effectively it means I can walk around the island with a small radio, and make contacts over several tens of miles as if I was stood on a mountain. Very handy!
You can find out more about GB3GD by visiting www.manxrepeaters.com