Trivia question: where is it?

[IanB]

A curious architectural feature and an amusing trivia question:

There is somewhere in London, adorning a building related to public transport, an architectural feature that looks like something out of the world of electrical engineering.

Can you identify where and what it is?

[IanB]

Picture:

[AlfBaz]

If it's not a lightning rod then surely its the aerial from "Hogans Heros"

[apelly]

Be very wary! That is an extremity of a prostrate Dalek.

[IanB]

More:

[Towger]

Southgate tube station

[IanB]

And so it is:

[electronics man]

I have never noticed that before, and I live quite neer it, strange

[G7PSK]

Looks very similar to Hangar lane station, but Hangar lane dose not have the Ht insulator on top, my grandmother used to live near there.

[JuKu]

Repurposed UFO, MiB style.

[cybermaus]

Ah yes, hiding the personal transport type UFO's in plain sight.
How about this alien luxury cruiser.