Total posts : 45366
You will probably not cover a “rather large house” with any legal Part 15 certified FM transmitter. It has been my experience that FM is just a waste of time and money if you want to a) operate legally and b) have any kind of useful range. If you just want it to go across the room, you’re probably OK, but that’s about it.
A lot of people have the mistaken impression that you can operate on FM with 10 or even 100 mW of power, as you can on AM. Nothing could be further from the truth! If you feed that 100 mW into a quarter wave wire (about 30″), it will vastly exceed the FCC limits.
The best way to legally cover your rather large house with high quality sound would be to purchase one of the 900 MHz or 2.4 GHz audio links that are on the market. You can very easily get the coverage you want, without having to fear the wrath of the FCC. The only downside is that you need a special receiver; you cannot tune it in on a regular radio.
Or, you could use AM. I am very pleased with the quality of the signal as received on a GE Superadio or any of several other high quality AM radios that I have on hand.
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