For improved reception, the experts on here often emphasize two things: a better antenna, and a better antenna-location.
If you are using the PRO106 to primarily monitor 800 mHz TRSs, you might consider an antenna that does a better job in the 800 mHz range than the stock antenna. If you are inside a building, or in a location where your surroundings interfere with the signal, you might consider an exterior antenna, or one elevated in the room or attic.
If you can give more details about your situation and radio-system(s)-of-interest, others might be able to give you a more robust answer to your question.
Hope this helps,