"Are you not liable to get ITAR'ed? I appreciate that it shouldn't affect you but ITAR has an amazingly wide remit and creep. Presumably they count as duel use and thus are EAR99? you poor ppl."

"Oups, I meant "The polarization of a horizontally orientated slot is vertical...", 
Thanks for all the time and information, :) Its inspired me to dig out my antennas books and try and get my head round slots,
will"

"Thanks Joe
Its handy that it is vertically polarised :) I still don't understand why a slot antenna is vertically polarised I will have to consult my RF books once I get a chance, but thanks for trying. (as I said antennas aren't really my thing)…"

""when laid horizontally, has a vertical radiation pattern identical to the dipole, with a slight null in the direction of the shorting strap.It is linearly polarized."
you don't mention the actual polarisation tho, as the conductor is perpendicular…"