FAQ: Can I use a tower on a trailer (especially if my permit is about to expire)?
In the past, the FCC has found that antennas mounted on trailers to be considered as temporary construction. In order to license a facility, the tower must be of "durable construction", meaning it is attached to a durable, non-movable surface and connected to a permanent power source. Therefore, you are unable to license a tower that is mounted on a trailer.
The only time when a trailer mounted tower is acceptable is in the case of an already licensed station needing to temporarily move to a different location and only if the FCC has granted a Special Temporary Authority to use the temporary facilities.
Citations: Broadcast Towers, Inc., Order, FCC Rcd. 7684, 7686 (MB 2011); see also Manitee Media Corporation, Letter, 33 FCC Rcd. 6685, 6690 (MB 2018).