jonstad, I thought I answered it If I can receive 2 FM translators one 10 watts and one 19 watts while driving up and down hills & through vallies with no ill effects on the reception our 13 watt station will do just fine. FM reception isn't like TV reception. Although FM does have mulipath it is just audio and it is very rare to hear the actual multipath (it sounds like a hiss similar to receiving a distant station) The only problem with reception is if you are on a mountain and are picking up a distant station. That signal will go away as you go down the mountain. If you are listening to a local station (IE: you are driving around in the 48 dBu Home Radio contour) you can go up and down the mountains and through vallies and the audio will be stable.