Nickeccles said:
I have one & they are excellent! Full stereo & need to be in a different room as signal very strong - harmonics spewing everywhere on the FM band & definitely not legal in the UK these wipe out everything on FM except the transmitter itself!! Sound though is really good!
Oh & the claim is a 15 mile radius if you are up high enough using just the telescopic aerial!
Yes, the 7 watt setting will SMASH local stations. Back in California I could obliterate "Real" stations up to 5 miles away. So I could see a 10 mile radius.
The only real issues I have seen, like you mentioned, is if the radio's are to close to the transmitter it will feed back or if it is at ground level it doesn't get good range. I also tried using it off a 12v car battery and an inverter at ground level and it didn't put out.
My best results were on the 4th floor of my house (here in Italy) and it penetrated *gigity* all the way to the basement and for miles around. I spoke to an equipment distributor in the UK that sells optional antenna's and I was told that with a better dipole antenna mounted on a pole on the roof, that I could get some serious range.
If your in the US, the 7 watt version in any city is illegal. You can't step on any revenue stations, have any cursing or sell advertising. If your in the country and there is some open frequency, your good to go.