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You don't need 25 modulators unless you already have 25 DTV boxes and want to use 25 DTV boxes at once... Before I got my Blonder Tongue modulators I had 3 cheap consumer modulators feeding 5 sets with splitters and RF switches. If you don't mind cabling wired RF is one method (it will work better with a Blonder Tongue AM series since the output is higher and it can take the attenuation of being split to 20+ TVs).
My AM series Blonder Tongues have the power to transmit over my entire property (and then some if I crank the output pot) and 1-2 are all I need (though I have more than that). How many different TV channels would your family ever watch simultaneously?...That is the number of modulators you need if you do wireless RF. If you have TVs in every room you could get RF IR remote repeaters in every room, universal remotes, and keep the modulators and boxes in a central location.
In the case of that CCII it looks like the buzz was in the TV, but sometimes it is baked into the modulator...cheap consumer modulators send the same carrier through both AM and FM modulation stages...if the AM video overmodulates it inverts the carrier phase and creates phase modulation with a 60Hz repetition. Any FM modulation creates phase modulation and any phase modulation creates frequency modulation and any FM demodulator is equally sensitive to both phase and frequency modulation so if the modulator creates phase modulation from video over modulation then it is hard to eliminate on the reciever end.
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