The problem you face is that to be effective as a scanner, the front end has to be open to the whole band. That means poor rejection of off frequency but high power transmissions like pagers.
Commercial gear avoids this by having front ends that auto tune to the specific channel, or at least, a narrow range, rather than being wideband all the time. This, naturally, costs. That's why you don't see it in scanners, though they do sometimes have 'bandpass' front end tuning, so that a VHF channel sets the front end to a VHF (wide) filter, etc.
Getting good intermod rejection is a matter of cost. Consumer grade electronics don't have it. Commercial grade does.
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N6IMN - GMRS WQGJ903
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