LineX Wireless FM Xmtr

I have that one (in the UK) and I'm very impressed with it. It's been used in three different cars with no discernible hiss or interference.

I'm not sure about 150ft but we had two cars and if the transmitter was in one, we got about 60-70 feet away before the signal broke up.

It only has four frequencies but completely blocks out any radio station that may have been broadcasting on the selected frequency, which is nice :).

I got mine through eBay for about ?30 (about $48).

Let me know if you have any more questions.

I have a couple friends at work that use them. I was very impressed. I work at Cessna and we have to use specific radio headsets (Peltor) and nothing else. So many people try to use mp3 players with fm transmitters. My friend told me to tune in on the station he had his set at and told me to walk across the hanger to the far wall. I walked a good 100+ feet until it was overridden by a popular local station at 107.3 MHz. So for just over 100 feet it had actually overridden the local radio station.

The only problem is that there are only 7 preset stations you can set it to broadcast over, and if you have a lot of people trying to use one, it could be a potential problem. A lot of people at work heard about this particular model and have been ordering them. So if more than 7 people get them there may be problems. I wish there was a digital version of this.

I ordered one off eBay yesterday though.