OK, this will get you a list of all FCC License Grants to look through in Penobscot County.
1. Click on Maine on the Main Database Page on RR.
2. Click on Penobscot County
3. Click on FCC Licenses tab
4. Click Display All Liscenses in Penobscot Maine
5. Click Business Conventional to ON
6. Click Business Trunked to ON
7. Sit back and search the lists for what you are looking for.
8. You may want to print this set of directions out for reference