Ham TV
One of the most fascinating, and certainly my favorite, mode of ham radio is Amateur Television, or "ATV". Using commercially available or homebrew equipment, you can communicate with other similarly equipped operators locally using video as well as audio. The standards used are the same as broadcast television (just lower power), so you can use your camcorder and VCR for video sources and your color TV as the heart of your receiver. Most stations use an ATV "transceiver", which broadcasts your video and sound on UHF amateur radio frequencies, and converts incoming ATV signals to a channel which your TV set can pick up. By adding a VCR, or perhaps a character generator or computer scan converter, you can put together quite a versatile station.

Once you have a number of ATV operators on the air in an area, you might consider building a "repeater", which is centrally located on a tower or tall building and re-transmits all ATV signals it receives with better coverage than individual station's alone would have. It also allows for all users to point their antennas in one direction, which facilitates round table video discussions without having to constantly swing antennas in order to point to the station currently transmitting.

Frame capture of one of the local ATV repeater station ID's as received off-air. The callsign "WA4UMU" is my old one, but I haven't gotten around to changing it since I changed mine to WZ4O.

Another of the repeater's ID's. There are four different ones that cycle through.

Frame capture of your's truly.

Frame capture of Trent KD4CHE.

Frame capture of Jerry K5FSS.

Frame capture of George KK4F.

Some links:
The Amateur Television Network - A large ATV group in Southern California.
PC Electronics - ATV equipment.