2 exact same setups - completely different gains

self.HeliumNetwork1m ago
So I have 2 setups about 2km apart. 4dbi antenna, LMR400 cable and 12m up high. LoS in both is above the surrounding houses. When I beacon with the first one, I get 10-14 witnesses. Some 30+km out. With the second one I get 2-5 witnesses, at most 3km out. First one gets about 3x more witness hits as the second one. All the while the setup is the same. Worried that my antenna on the second is broken or something (is that possible that is still works but with decreased signal?). Anyone else have this issue? Anyone know what can be the problem? (I have taken into account the recent issues with PoC and stuff).