I just installed a K40 with a magnet mount on top of my van roof and get really good SWR readings across the band and it is suppose to handle 300 watts. I got it from Walmart .com for less than $100.00 and a 1/4 turn dismounts it from the magnetic base for those low canopies and garages. But then again everyone has different demands from their antenna system. I don't think I'll ever need more than 300 watts and I didn't break the bank!