I saw your post and thought this might help. I'm using 1.3Ghz for video, 900Mhz for telemetry, and 2.4Ghz for RC
These systems are not cheap, unless you can get a used system.
I'd recommend a circular polarized clover leaf antenna for the rx side to help with multipath and polarized signals.
There is also another source I've used for many years here:http://www.rcgroups.com/video-piloting-fpv-rpv-469/