The new Stryker SR-2K offers outstanding performance & efficiency, excellent quality and includes two different shaft lengths (5" & 10") It's essentially two different antennas in the same package! Every installation is different and with so many variables sometimes a 5" shaft just won't work as well as a 10" might. The problem is odds are you already bought the 5" version installed it. The store isn't going to take it back and now you'd have to spend more money on another antenna. That's the beauty of the SR-2K, we give you both shafts so if a 5" isn't quite right all you have to do is screw on the longer shaft. We take the guess work out of the equation! If you need a high performance center loaded antenna that won't let you down then look no further than the SR-2K. We're confident in the quality of our product that we include a 2-year warranty. Strykerradios have quickly become the best in the market and in high demand with amateur radio dealers across the globe Another important feature the SR-2K brings to the table is it's power handling capability; 3600 watts!