Rooftop tower installation by Penn Tech International Penn Tech, International - Penn-Tech International They will do private work for individuals willing to pay for professional towerjacks. In a total of 13 hrs they installed this 4.5 ft Glen Martin rooftop tower with 3 side arms and a 10 ft center mast. The LMR-400 and -600 cables come down through a plastic cable duct. Tower and all antennas are each individually grounded to an insulated bus bar that is CAD-welded to an 8ft ground rod sunk below grade. I provided the antennas (Maldol HVU-8, Diamond discone, Nil Jon Super M, and a Comet SB224 with ground plane kit) and FFC pass-throughs. Total cost of installation was about $4000 for antennas, parts, and labor. Anyone looking for tower erectors in their area can check out NATEHome.COM: Home Page