You might find this interesting ...
https://wiki.batc.org.uk/Getting_StartedAlthough its from the other side of the pond the basics are probably the same.
Most ATV in the UK is now digital, on 23cm and higher.
Back in the day there was analogue B&W ATV on 70cm, but our band is only 10MHz wide so ATV was crowded out by voice and satellite activity.