What is the maximum height above ground for an antenna structure not near a public use airport without requiring notification to the FAA and registration with the FCC?

Under FCC Part 17 and FAA regulations, an amateur radio antenna structure that is not located near a public use airport does not require formal FAA notification or FCC registration unless it exceeds 200 feet in height above ground level. This rule is strictly designed to ensure aviation safety by tracking very tall structures that could be hazardous to aircraft in flight. If you plan to build a tower taller than 200 feet, you must go through the required legal notification and registration processes. Heights below this threshold are exempt from this specific federal rule.