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 described in detail by Stephen Dubin & others : http://www.worldwidedx.com/threads/my-guess-is-its-an-antenna-specialists.168114/ but I do not know the diameter of the hair pin wire. I am referring to it as beta match, forgive me if it is something else. I have read: All radiators are 104": 1/2" x 59", 3/8" x 44" , 1/8" wall 59+44 = 103" (but they must overlap as they fit within each other) (knowing the un-assembled lengths would be great) I have read elsewhere the ground plane radiators should be 5% shorter, but not sure if thats true, or applicable due to the beta match. 104" x .05 = 5.2" 98.8" shorter, or 109.2" longer Driven element has single drain hole Driven element does not contain re-enforcing dowel Driven element ?-inches above mounting baseplate due to mounting stud. The beta match is 7.5" x 1.5" separation. Attaches to underside of ground plane radial, and side of driven element Hole for beta match attaches (?-inches) above base plate to driven element. (7.5 - (1/2 /2) - 1/8) = 7-1/8" visual estimate (beta meas.) - (1/2reflectDiam). - (mountPlate) = ?-inches of 1/2" material secured to base plate as radiator, 1"-??? Ground plane elements offset ?-inches tangent from centre of base : 1-1/4 to 1-1/2 ??? (guess) I know if I bend radiators, I can forgo the beta match but modifying the original design is not where I am hoping this thread will go. There was one on ebay I missed out on, and have not seen since or I would buy and share it in detail. If anyone is willing to measure/confirm the fine details of this antenna, (or have ANY parts of a dead one they'd be willing to part with for examination purposes, please contact me). Or a whole unmodified unit. Why not build a different one ? I don't need a different one as I have a .64 wave. (sorry, not for sale) This is somewhat sentimental project as this was my first antenna as a kid. I'm pretty sure I have the original manual from 1977. Any help would be very much appreciated. Doug.