I use a G7-144. There are models that go higher in frequency. Its been on a water tower for 8 years, subject to ice and high winds in thunderstorms and its still as straight and swr wise , as good as when it was put up. I am using lmr 600 cable. Could be better but didn't have the man power for hard line erection. Using GM-300 repeater with a RIK 1 controller. Pretty low cost but effective. Antenna should cost about $195.00 dollars US. Gain ,the book says 7dbd, our club has several located on remote sites and all have held up. After 20 yrs or so, they get weak at the joints and have failed at that point. Fiberglass, Phelps Dodge and others, yes they have had a lighting strike and what was left was not pretty. Those have been replaced by 4 bay dipoles.