ATV questions
 

I am interested in getting involved with ATV, and have been having
some trouble finding good info on the equipment needed.

from what I can understand, there needs to be 4 (or 5?) things between
the video signal source (i.e. camera) and the receiving TV: the
downconverter, (the pre-amp?), the transmitter, the receiver, and
another downconverter... correct?

Also, from what I can tell, you're only supposed to transmit on
specific bands. Is it possible to select a band where there might be
less ATV traffic? What all would be involved in that?

Thanks in advance for any info!
Dave