Found as I was scanning Ebay this morning, looks like a cool little item.

no affil

http://cgi.ebay.com/Vintage-TV-FM-Amplifier-Model-HAB-Blonder-Tongue-Labs-/280700185607?pt=LH_DefaultDomain_0&hash=item415b08ec07

I've got the american made equivalent attached to the back of my 67' color Airline.
http://i1095.photobucket.com/albums/i469/ElectronicMemory/DSCN0834.jpg

I've been meaning see if it works, and see if I can get it to transmit.
When I got that set from the spot it sat in since new I remember unscerwing what seemed like a dozen twin lead lines and thinking "Wow I know this is a fringe area for several cities, but who would need so many antennas!?". Then I realized that most of those lines ran to other TVs, and not to over three extra antennas!

Tom C.