Topband: Beverages and wire fences?

[Neil Carr G0JHC]

I have the option to run a beverage  across the top of a wire fence. Similar
to the picture before (that is not my QTH!) 

 

 

http://www.fotosearch.com/bigcomp.asp?path=GLW/GLW297/gwt145038.jpg

 

 

The fence is **NOT** electric. But it's not mine and I need to be discrete.
I have obtained permission.

 

 

My question is how close can I run the Bev wire to the fence wires without
interaction?

 

Do I need to extend the fence ports and have it XYZ distance above, or can I
fix it to the existing  posts and not worry that the Parallel fence wire is
only a few inches away, or am I asking for major interaction issues?

 

 

Any real world or theory observations on this  appreciated.

 

Thanks

 

Neil G0JHC