Recent content by Doug_007

108" / 1.05 = 102.9" (5%) 2/3" difference (103.5") I had mentioned hearing there was a 5% difference between radiator and ground plane and I guess it makes sense for the ground plane to be larger, and that seems to about fit. 4.35% fits your numbers. If I can find an alumn top/bottom base...

Thank you :) My collected info is from linked post, and one other post found through google. Some measurements are estimates based on posted photos. My math for the height of the hole for beta (always thought it was gamma-match) is I think 1/4" in error. Archer 3-element "All-Band Monitor...

Hi all, I am wanting to build the old radio shack (Archer 21-901) 1/4 wave CB ground plane antenna. As these were mass produced, aiming for exact measurements, allowing for minor construction errors should yield matching (near factory) results. There is a link where it is almost completely...