1) Radio frequency antenna type
Found on
https://www.crosswordclues.com/clue/cage-aerial
A Cage aerial is a radio antenna, which consists of the top portion of a tower or mast and of several parallel wires, which are radially arranged around the lower part of the mast. one advantage of the cage aerial is that the supporting tower can be grounded, allowing it to be used for other radio services, such as a support for VHF or UHF antenna...
Found on
http://en.wikipedia.org/wiki/Cage_aerial
No exact match found.
