I saw this post on hackaday: http://hackaday.com/2012/03/30/working-software-defined-radio-with-a-tv-tuner-card/
Could you feasibly use one of these for receiving AV from a 5.8ghz transmitter?
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Hi Luc,
The RTL2832 based dongles typically go up to around 2GHz, so you couldn't use them for 5.8GHz. You could write a GNU radio graph to receive the 3DR-900 or 3DR-433 signals for telemetry, and that would be an interesting exercise, but you'd need a quite different SDR to handle the signals for a 5.8GHz AV receiver.
The other problem is receive sensitivity. Those dongles are great fun (I have one and use it for things like ADS-B), but their receive sensitivity is not on par with good purpose built receivers, so they won't give you long range.
Cheers, Tridge