Calhoun, Greene, Jersey, Macoupin, Montgomery, Madison, Bond, St. Clair, Clinton, Monroe and Washington Counties.
 
155.37 CSQ, Point-to-Point is used for communications with agencies in St Louis MO area (unsure if still used by ISP Troop 8)

ISPERN talkgroup appears to repeat mobile units using TX D156 or 67.0 PL, but not CSQ (6/24) [When acitivated by dispatch] (Base on 155.475 appears to be CSQ as to not feed back into patch]
* When VHF is activated on the talkgroup, only units using D156 transmit appear to multicast on the ISPERN talkgroup.  ISP Dispatch broadcasts as CSQ. (7/24)
700 MHz mobile extenders are no longer be in use, as portable radios are now using VHF-to-700/800 (155.505/151.16 in some areas for MX)