Are you running a Hard Top or Hood with a heated rear screen ? I ask because many years ago you could get a conversion kit that would allow the heating element to run as an arial as well as a heater. I had one and it worked very well.
As for fitting something under the front screen cover, well good luck as its very tight under there.
Just had a quick look on e-bay and found this,
http://cgi.ebay.co.uk/Isolater-Amplifier-unit-Rover-800-Saloon-Screen-aerial_
Dam me its off a Rover.
This is the link:-that link isnt working mate
nope no hard tops for me lol, like to roof down too much! lol
where there's a will there's a way i'll figure something out!
cant remember if you've got one or if you're just hoping to pinch clives when he fits the roll hoops, but would it be possible to attach one ( like the heating element type) to a windstop?
Cheapo mini aerials for £1 work ok in strong reception areas like cities.