I finally got my RF Explorer (240-960MHz model) and I have to say, this thing works great.
I was curious so I tried running the explorer at a couple sites I've flown at - One site I was able to hit 3.3 miles with no signs of video degradation (turned around due to battery life), and another site I couldn't make it 1 mile before the video started getting fuzzy.
See if you can figure out which scans of the RF explorer came from what flying sites? =] Both were set up for the same parameters: Centered on 910.000MHz, range -40 thru -120dbm, using a magnet mount antenna somewhat tuned at 910MHz (my calculations may have been slightly off). In both cases, I was running the unit in Max-Hold mode, letting it scan for about 5 minutes to see if there were any errant spikes in the spectrum range.
Of course, these scans were taken without my video tx running (didn't even have the plane with me), so it's just a sweep of the noise floor, not counting how my video signal competes with it.
This little device is invaluable for figuring out whether I should even bother trying to fly at a particular site; just checking various places around town shows just how saturated the 902-928MHz ISM band really is.