These antennas use the basic design of the original DK3 antenna plans from Don Johnson W6AAQ. Kenneth Akerman, K8RWK started building the antennas in the mid-1990s and made substantial mechanical improvements to the basic construction. I used one of them on my semi and straight truck for over 950,000 miles and it is still in use today. They have proven themselves for ruggedness and reliability. K8RWK became a silent key in May of 2005 and I picked up where he left off and continued to improve on the DK3 design. After 2006, they became only available with a copper mast. The latest improvement was the addition of a 160 Meter accessory kit in 2008.