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I'm not far away in Canvey Island, hope to have a mesh antenna for 5.6GHz up on the house before too long and hopefully do some portable operation in the area.
Most won't do a low enough symbol rate, as stated some TBS Cards/USB might go lower but that depends on the software. I just got rid of my TBS 5520SE as it was flaky, can't remember how low it went though.
Quite a few ATVers use Comag receivers, and you can buy a whole mobile (caravan) setup in a suitcase for around £30.
Comag Satellite receivers.
Or the Satlink Satellite Finder.
For best results you should add a pre amp in the Antenna feed.