anybody have any experience or know anything about this add on groundplane kit ? any idea how durable it is ? MACO :: Products>Antennas http://www.eagle1com.com/storepp/antennas/maco/GPRK.pdf this place has them for $40 + S&H . (yes a pic of the 107 , not the boomer) Electronic Service Center anybody know anything about Electronic Service Center ? anyhow ..... looks to be 7 foot aluminium elements that attach to a hub that fits over the mast/pipe with a few set screws for attaching to the mast . neither maco or the pdf state what size pipe the hub would fit on , does anyone know ? 1 1/2 - 1 5/8 would be perfect . eagle has it for $40 bucks , i figure 10-15 for shipping so its about the same price as just ordering the tubing id need from DX Engineering but i dont have to figgure out and fab and a mounting plate for the ground elements .