Arlingtoncardinal.com/Chicago_Scanner

The Uniden SDS100 and SDS200 scanners are the best scanners available because they are capable of Digital P25 Phase II reception AND are more capable of processing signals in simulcast tower situations, where other scanners may be unable to process multiple staggered incoming signals, which causes dropped audio. Less capable scanners may only work with a Yagi antenna aimed at one radio tower.