Did these antennas do any good?
My experience with the 1/4 wave nmo mount and the center load/coil spring nmo mount made no real difference using motorola micor radios on 851.0??? mhz we used on black mtn conventional repeater for cal-state auto assn in sf bay area in 1986.
I would try switching them when i was in remote part of san mateo county ca and as far as recieving it no difference however this was mountain terain not flat long distantance, transmitting i couldnt tell and to my knowledge the micor radios were 100 watt.