What do you mean by a beacon light? Why would you think one is required?
This is from UNITED STATES DEPARTMENT OF AGRICULTURE, Rural Utilities Service, BULLETIN 1728F-810
"1.5.5 Structures and Conductors in the Vicinity of Airports or
Exceeding 200 Feet in Height - In cases where structures or
conductors will exceed a height of 200 feet, or are within 20,000
feet of an airport, the nearest regional or area office of the
FAA must be contacted and if required, FAA Form 7460-1, "Notice
of Proposed Construction or Alteration," is to be filed."