I'd like to suggest the Bearcat - Unden Line of scanners,
I have an older (1994) BC800XLT that covers
the complete 800 mhz band including
the cellular frequencies. It was made just
before the ban on cell frequencies on scanners . I picked it up
at a flea market for about $30 with the instruction
book. It's a desktop unit. UHF is best with an outdoor antenna in my
area.

Check universal Radio's used list, they always have a few scanners
there .
I would'nt buy a modified scanner, just my opinion.

Charlie