The HB100 Doppler radar modules can be bought for just a few UK pounds on eBay. These are the modern day equivalent of the Gunnplexers of old. A range of 161km has been achieved with one of these at the focus of a dish antenna on wideband FM.
In conjunction with a separate LNB converting down to 600MHz and a wideband FM RX and you have the makings of a low cost 10GHz system. This was recently used by G4HJW to cover a 10km path. I think Bernie was using just the HB100's own antenna. The HB100 is basically a small PCB unit.
At least one UK station is trying to design a stand-alone 10GHz transceiver based on the HB100 module. Watch this space!
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