Welcome to RR. STARnet can not be monitored by any scanner, and is not expected to ever be supported by any scanner. See: Pennsylvania STARNet Trunking System for the notes on Conventional Freq used as talk-around.
However, there are UHF and VHF frequencies that can be used to contact local agencies. I have heard testing on some of them, but nothing else. Here are the ones that have been licensed, but there are otherVTAC/UTAC that may be used as well
0453.4625 U-TAC 1 (appears to be common statewide)
0453.7125 U-TAC 2
0453.8625 U-TAC 3