RE: 420-450 mhz band for video
skypilot,
Tom at hamtv has good quality equipment. I use it in my univ research project. His 1.5 watt 420-440 tv tx is well built and good quality but it is not plug and play. It requires mounting in a case and fitting with an antenna. It is AM modulation, so you can receive it with most standard tvs using a cable channel (58, 59 or 60). I get solid picture using the TV rabbit ears and the 1.5 watt tx at nearly 3/4 mile between the plane and the tv. With a more sensitive receiver setup (better antenna and downconverter), the range is a couple of miles minimum. You need a ham ticket to purchase the equipment.
Elson K2BUG