Partly because bandwidths are very low, there has been a revival of interest in NBTV systems similar to the early TV transmissions by Baird in the 1920s and 1930s.
There is even a Televisor kit available for about £40 delivered (in the UK) with a CD with some still and moving images and its own test card generator. I am quite tempted!
The televisor kit is available for £35.94 + shipping from http://www.mindsetsonline.co.uk/Site/Home (search for televisor). This is compatible with the 32 line standard of the NBTV Association. The NBTV Association home page is at http://www.nbtv.wyenet.co.uk/index.htm .
Bandwidths are audio only, so a tape recorder or CD are fine. Over the air transmissions only require audio bandwidths too. Of course, with just 32 lines don’t expect brilliant images!