Are there specific FCC regulations that mandate fencing for LPFM (Low-Power FM) or other FM broadcast towers, similar to the requirements for AM towers?

The Federal Communications Commission (FCC) does not have specific regulations that mandate fencing for LPFM (Low-Power FM) or other FM broadcast towers in the same way it does for AM towers. However, there are still considerations and best practices that station operators should be aware of regarding tower safety and security:

1. General Safety: While not mandated by the FCC, it is essential to prioritize the safety of your tower site. Ensure that the area surrounding the tower is safe and secure to prevent unauthorized access. This can help protect both people and equipment.
2. Access Control: Consider implementing access control measures to prevent unauthorized entry to the tower site. This may include gates, locks, or other security measures to deter trespassing.
3. Warning Signs: Install warning signs at the tower site to alert individuals to potential dangers associated with radio frequency (RF) radiation and high voltage. These signs can help inform people about the risks associated with tower sites.
4. Public Safety: LPFM stations should consider the safety of the general public when siting their antennas. Tower locations should comply with local zoning and safety regulations.
5. Compliance with Local Regulations: Check with local authorities and zoning regulations regarding any specific requirements for tower safety and fencing in your area. Local regulations may vary, and compliance with these rules is essential.
6. Equipment Security: Besides tower safety, also consider the security of your equipment and facilities. Install appropriate locks and security measures to protect valuable broadcasting equipment.
7. AM Tower Fencing Requirement: The FCC requires AM towers, especially those with radio frequency potential at the base, to be enclosed with effective locked fences or other enclosures. This requirement aims to prevent unauthorized access and protect individuals from injurious burns due to RF radiation.
8. FM Tower Safety: Unlike AM towers, FM towers themselves are not radiators of RF energy; instead, the antennas mounted on the towers serve as the radiators. As a result, touching an FM-only tower structure at the base is not likely to cause RF burns. However, FM antennas should be constructed in a way that prevents easy access to the radiated portion, such as climbing the tower.
9. RF Exposure Guidelines: Requirements for fencing may come into play if it is determined that radio frequency exposure exceeds certain guidelines for uncontrolled (general public) environments. Fencing may be necessary to restrict access to areas with high RF exposure.
10. LPFM Tower Requirements: LPFM stations follow specific guidelines to ensure tower safety and compliance with RF exposure limits. The FCC provides a worksheet (Worksheet 3) to determine whether additional environmental studies or fencing is required. Key considerations include the distance from the base of the antenna to the lowest part of the antenna (a minimum of 21 feet) and the minimum distance from the radiating part of the antenna to any person (a minimum of 20 feet).
11. Shared Towers: When an LPFM antenna shares a tower with other FM or TV broadcast stations, the process for ensuring safety and compliance may become more complex and involve coordination with other broadcasters.

It’s essential for LPFM station operators to follow these guidelines and conduct any necessary assessments to ensure tower safety and compliance with RF exposure regulations. Consulting with experts or organizations experienced in tower safety and RF exposure calculations can be valuable in ensuring compliance.

While there are no FCC regulations mandating fencing for FM towers, ensuring the safety and security of your tower site is a responsible and practical approach. It helps protect both people and equipment, minimizes the risk of accidents, and maintains compliance with local regulations. Always consult with local authorities and experts when making decisions about tower safety and security.