GRE designed radios are well known for poor filtering. Especially from signals from FM Radio Broadcast towers.
I had the exact same with all my GRE designs and even though the area FM stations are 10+ miles away, I still needed an FM band filter such as the one offered by PAR Electronics.
That filter does wonder and will usually knock those ghost signals down to nothing for the VHF band.
Other problems affecting the rail band can be VHF Paging signals. They are often located on top of are near a cluster of hospitals. The paging signals will also wreak havoc with the GRE designs. (The TRX series are GRE designs as are several models branded with the RadioShack name.).
The common paging signals that affect VHF on the GRE designs fall in the 152.xxx MHz range as well as the 158.xxx range.
If you have another radio can can search 152 to 153 and 158 to 159, find out which band or both have high power paging signals and purchase the appropriate filter(s) from PAR.
One last common culprit can be from the NOAA WX broadcasts in the 162.xxx range. If you are within a few miles of a NOAA transmitter, a NOAA WX filter may also help.
The FM Broadcast filter will often take care of a lot of the problems by itself but if you are near hospitals, one or both of the VHF paging band filters may also be needed.
One must remember that FM Broadcast stations can run 100,000 watts of power. Way more than enough to desense or overload the front end in poorly designed receivers.
These filters usually turn a deaf GRE design into a well working radio.
Filter links below.
PAR Electronics Inc. Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave
www.parelectronics.com
PAR Electronics | Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave listening enthusiasts Us the VHFSYM152HT for 152 MHz Paging, The VHFSYM158HT for 158 MHz paging and the VHFSYM162HT for NOAA WX band. For FM Broadcast stations, the VHF-FM filter is the one.