So shortly after my last post here I got a OmniX now I know it says Tuned: 118-137, 148-175 & 225-900 MHz but I didn't think it would so bad in the 142mhz range. I listen to this system a lot https://www.radioreference.com/apps/db/?sid=2560 now the digital channels work nice but the analog ones are full of static which I didn't have before with the ST-2. Almost thinking of refurbing my ST-2 and putting it back up on the roof.
How long has it been since you stopped using your ST-2 and began using the OmniX? Is it possible (even remotely) that another RFI / EMI noise source has appeared in that time.... even something you inadvertently created such as by installing a noisy LED light bulb, noisy AC adapter / switching power supply / "wall wart"? Or something that has appeared in your vicinity as a new source of RFI, e.g. leaky CATV system, noisy electrical pole, neighbor got new washing machine (yep... there's another thread on how washing machines can be major sources of scanner interference).