Aerials question

[RegandPat]

I have been cleaning the roof of the van and noticed that there was a screw missing from the dome aerial, I could only see one side and my hands was freezing.
Now am I right in thinking I can put a small self tapper screw in ?
Reg

 

[Woody3]

Is this on the roof plate, the pedestal, or the aerial itself?

 

[RegandPat]

It is the pedestal, looks like it stops the dome part from lifting off.
I will get the ladder out and have a look again just to make sure.
Reg
Added, I have had a look at screw missing, it is a alien screw (think I spell that wrong, hexagon head) it just needed tightening up a bit.

 

[Chris_Hyde_Cheshire.]

Reg, do you mean a "grub screw" orther wise known as Allen screw? - A screw with no head and normally hexagon headed