The following is from a post I made a while back (found by using the "Search" feature)
For actual LZ operations, the HCFR LZ Control talkgroup on the Hillsborough system is 593/04-101 (simulcast on both sites). That tg is hard-patched with 153.920 PL 100.0, which is a mutual-aid/public safety freq of some sort - don't know the official designation. The FCC says it's licensed to the Sheriff's Office with a control point at Office of Emergency Preparedness.