Hi-Fi Stereo FM Transmitter

[billbo911]

I moved into a new house (well, new to us) in January. After months of projects that had higher priorities, I now am working on a project that is more along the lines of comfort and convenience.
In the main living room in the home is where the entertainment center is. My surround sound system has a secondary audio output that allows me to route through to it any of the audio inputs. This way I can listen to any audio source I choose in another area of the house. Previously I just had it interconnected to the stereo in the master bedroom. Now in the new home I will be setting up stereo's to run speakers in the garage, three different locations around the yard and in the master bedroom. I have NO DESIRE to run interconnects to all these locations. So, my solution is to build a low power stereo FM transmitter and just feed the aux. output from entertainment center to it. That way I can just tune in the signal at each receiver/amplifier and have the same audio throughout the entire home.

Here is the deal. Although I am an EE, I really have had no dealings with RF let alone broadcasting it. So, I purchased a small DIY kit. I will be powering it from a 5vdc wall wart and dropping the supplied voltage to +3vdc with a 333ohm resistor and a 3vdc Zener. That part is easy, I just want to make sure I am thinking this through correctly.

Will this transmitter be sufficient for 2000 sq ft home on a 1/4 acre lot. It will be centrally located. Or, will I need to boost the signal to between 500mw and 1w?

(Why do I have a feeling I'm gong to hear from Al and Alan?)