"Free Radiate" Systems
In 1990, the FCC amended the unlicensed low-power AM regulations to allow the use of an antenna to provide AM radio coverage on the campus of an educational institution. This provides many broadcasters with an exciting new opportunity to cover a large acreage from a single transmitter installation.
The new federal rules now allow the use of an AM vertical antenna on many educational campuses*. To help you benefit from these new regulations, Radio Systems, Inc. has developed an efficient, easy to install and operate, complete AM transmission package. The system includes a proprietary AM antenna, antenna tuning unit, transmitter, all hardware, cable and connectors, and complete installation instructions. Contact Radio Systems for regulations and pricing to see if a vertical antenna system is right for your station.
FCC Rules - Original Text