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First, my apologies, “RF Burns” is running a LPB unit.
***Very strangely, the Radio Systems TR-6000 is shown both as a variable output transmitter up to 30 watts, and also (on the same site) as 10 watts. Confusing … I’m going to have to email them and get the straight skinny. iAM, same people that sell Talking House AM transmitters, sells them, and also the companion CP-15 Coupler, but with no prices available online, either form Radio Systems or iAM.
Also, Radio Systems shows BSW as a dealer, but I couldn’t find it in a catalog either online or off.
I believe the TR-6000 output can be adjusted, and is touted at 80% efficiency. The CP-15 Coupler is rated at 20w max input, so you’d have to attenuate at least to 20w if you want to use that coupler.
Still, that should be enough to get you where you want to go.
***Leaky cable seems very similar to CC. Drive-in movie theatres were using these things all over the place (remember drive-in movies?).
For FM there are no further caveats I know of that would preclude using leaky cable as the antenna … IOW, you still can’t have more than 250 uV @ 3m from the emission source. But a leaky cable around a large parking lot could be fed from something like a Decade 850 with an RF power amp, carefully adjusted to meet the regs, with all the measurements recorded and filed. Some good coverage, though.
Pro gear that can do that aren’t toys, either. I’d get some really good engineering advice, come up with a viable business plan, and start looking for used gear … but it would surely be a rare find! New stuff is spendy …