I purchased their 440 antenna built a year or so ago and waited forever to get it. The wait wasn't really worth it in the end and I felt like I got a better downlink signal with a homebrewed K5OE design. In both cases I used a preamp close to the antenna mounted at about 20' above ground. I'm now in the process of trying to build a few other stationary antennas and will let the group know the results if they are worth reporting! Rick W2JAZ