I had the same thing with my RS Pro-2017 with the RS discone ant. drove me nuts for a while till i finaly figured it out. It was on all my 150-155 freq. . Finaly was able to catch the K3SMT clear enough to make it out, then searched for the call sign.
I just switched to a GRE PSR-400 and put all PL's in and have'nt heard them on it, but still hear then on the 2017 with the stock ant.. Just have to turn the squelch up till it goes away.
I have them in the 400 as 147.375 J'town RPTR (at airport) and 443.250 UHF. In My Ham bank
Is this there web site.