Get a new scanner, I just sold a BC350C for same reason. Some freqs came in good while others not so good. I would connect my BCD996T to same antenna and all freqs came in great no problem.
The BC350C/BC355C are low tier scanners. A better scanner would be a BC15XT.
The BC350C/BC355C are low tier scanners. A better scanner would be a BC15XT.