These modules are very low cost. They make the heart of a very low cost wideband FM system for 10GHz. They are the modern version of the Gunnplexer. They contain (I think) a transmitter, RX mixer and 2 antennas all on a small PCB. If you spend £5 you will have change from some eBay suppliers!
"204km. NEW WORLD RECORD, Full Duplex 10GHz with HB100 only 10mW!
Team #1: Giuseppe IK8XFR - Nino IZ8WLZ - Giacomo (Jack)
on S. Giovanni a Piro JN70RB
Team #2: Giuseppe IZ8WGU - Domenico IZ8BAD - Gianluca IZ8YWC - Antonio IK8TGH
on Solano Sup. JM78VF...
Strong signals, how many Km can still make HB100 with only 10mW?"