Mike,

Real Estate agent's radio transmitters (0.4 Watts, MW, coil antenna) --
where are brochures for them on the web?

I think this is the sort of thing you're looking for:

http://www.talkinghouse.com/newweb/

Easier enough to find on Google!

There are plenty more out there.

--
Philip de Cadenet
Transmitters 'R' Us
http://www.transmittersrus.com