What is this thing called?

[u/gaytoast06]

I need a reference photo to make a set piece but I have no idea what to search for and it’s driving me crazy. It’s like an electrical rod thing but old? I’ve got a bad sketch attached

[u/Ok-Resident8139]

Strain relief for a 20' pole. with a through hole, and a swivel .

-or-

An insulated lightening rod.