Not sure whether this will fit any Skoda models but it's worth a shot:

 

Have a 10cm short aerial which has come off a Mini Cooper (recently sold).

 

Will get a picture up later tonight but to give you an idea, it's something like this:

 

 

 

£5 plus postage

 

 

Noticed another thread and realised that this is still available.

Oops maybe I should read it all first :(