TV TX power is not cheap.

It's all in the antenna and HAAT.

Back in the 70's a London AM pirate station dabbled with TV and played
with a couple of watts and a simple colour bar generator to feed it.
Using a simple yagi antenna atop a local hill they were received around
15 miles away albeit line of sight.

Good quality antennas such as panels are not cheap and in fact for a low
power station, say up to 10 watts the antenna system costs more than the
transmitter.

However, for an economical vertically polarised antenna at low power one
can get away with a wideband co-linear which is only a few hundred
dollars.

You do need good bandwidth.
--
Philip de Cadenet
Transmitters 'R' Us
http://www.transmittersrus.com