Nov 27, 2018 · Yes, as noted by WB3BEL, if you want the mast to be transparent to RF for a vertical or X-polarized VHF yagi, you need to run the coax from the driven element(s) towards the rear end of the antenna boom and let it (or them) hang down "behind" the antenna for a wavelength or so, otherwise the coax running down the fibreglas mast creates the same problem a metal mast does: An undesired, untuned ... Aug 18, 2020 · K5ND Fiberglass Push-Up Mast During my recent ARRL Learning Network presentation on six meters, a popular question was what fiberglass push-up mast I was using in my backyard and in my rover operations. It’s a Max-Gain Systems MK-4-HD 25 foot fiberglass push-up mast along with their Heavy Duty Mast Mount with Tilt-Lock.