If you are still experiencing the "regensburg syndrome" then you need to either replace your antenna (you can get a decent one on Ebay for about £15) or move it to a better position.
Mine is now positioned on top of the Metal Vents for the Windscreen de-misting Next to the climate control bit on the dash by the screen (bit hard to explain and i don't have a pic to show you but will do as soon as i can. It doesn't look out of place and the only people who ever ask what it is are other Octavia owners. Nobody else bats an eyelid.
I found that even having it under the plastic Dash tray still reduced the signal quite a lot. i used to only get maximum of 7/12 satellites and generally 5/8 i now get at worst 2 less than visible and generally all visible satellites are locked onto.
Carl