In Maryland, don't know about elsewhere, this is the Mutual Aid freq where one jurisdiction communicates with another. For an incidents somewhere near a boundary line a piece from the neighboring county/city is likely to be on the run card and you'll hear A county to B county, your engine 123 due on box.....
Anyway, if you start using it for tac then this will limit airtime for mutual aid needs for probably a 100 mile radius (the receivers/antenna setups can really pull in a distant signal). If you choose to pursue this you may want to get a written OK from every municipality within about that 100 mile radius. Good Luck.