Unless things have changed in the past 22 years ,unlicenced TV Xmitters are limited to 100mw. I was working for a company that dabbled in the things as temporary security units. I belive other companies sell them today as complete units.
We used short rubber whip antennas with decent results. These were B&W Xmitters and cctv cameras.
Not much to go on but thats all I have. 
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- Outlaw
Main: 9090DB, Snell Type EIII's, Marantz 6100, TEAC PD-D2500
LR: Motorola tubes, EL84 outputs, , Dual 1019 TT, Sony CDP-CE105, Wharfedale Sapphire SP-89's and a 15" GV center in an infinite baffle
Home Office: Sansui 6060, Sony CDP-C305, Original Advents
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