My Zero 5 antenna will not load on 160 0r 80. Radio-Yaesu FT-450D Tuner MFJ -994B Antenna Zero 5 Antenna has worked great for more than 3 years. All bands fine into dummy load in shack. Installed dummy load out at antenna. Everything there ok also. Also have Ameritron ALS-600, but not part of problem. I can't think of anything that could effect frequency of a vertical antenna on 2 lower bands only.