The antenna on this 71 240z does not seem to be stock.

Here are the parts (in sequence) when removing/installing

The area between the rear quarter panel (fibreglass) and the rear deck:

There is a wingnut and stud which I guess is where the original antenna is attached.

There is also a drain hole for a tube coming out of the antenna (potential fume hole).

Lots of painted ziebart in the bottom too

Here is the tube in place.

I used the wing nut to ground the antenna's ground lead.

Blue: what makes you believe it is not stock? The part I can see in the photo looks stock to me.

Dan

Stock units I have seen only have a thin bracket with one bolt hole. This has two.

Here is a stock:

Edited October 15, 201113 yr by Blue

I think the unit is stock just not the bracket

I'm with Dan. The antenna looks stock, exactly like my former car's, but not the bracket.

Edited October 16, 201113 yr by Arne
typo

I am out numbered by good friends. I must concede. The resto is someone else's cars so I will ask the history (He was original owner so he should know). It was interesting to see the two holes in the yellow pic above. This car has no holes due to body work so I will have to re-drill.

The fact that all pics I googled have only one bracket that goes deep to the wing nut; but the 73 yellow photo above seems like the correct drilling for the holes, I see how it should work but I am confused.