If you have any knowledgeable Amateur Radio operators on your team, it is possible to use Amateur TV to do it. I'm not sure what frequencies are allocated for ATV, but I know that you can do it on 6 Meters (50 MHz) and 70 cm (420 Mhz). If you use a 420 MHz system, you can use a cable ready TV with a antenna to view it without any additional gear on the receiving side, because some of the high cable channels use those frequenices. Depending on if you want color or black and white, you can probably set up a B & W system for about $100. The American Radio Relay League has more information on this. (
www.arrl.org)
Remember though, an FCC licensed ham must be present during the operation of the transmitter. Identificaton rules still apply also (you must identify your call sign every 10 minutes on the air). I would but a small card with the call sign in the view of the camera on the robot. Good Luck...