alpine tv tuner help

Is there any way i can improve reception?  I mounted one antenna on my back window, and the other on my sun roof.

  Ihave fitted alpine tv and the standard aerials are weak i have used a german hershman twin pad mobile phone aerial you will need to change the connector on the end mount the pads as far apart as possible behind the rear plastic bumper with sicaflex  check reception before mounting should do the trick have also used bosch roof mounted aerial with good results hope this is of help  aussie-tech

Could i get those over here in the US?  Where did you buy these?

  to civic 545 you should  be able to get the bumper aerial  from car stereo shop what sell mobile phone incar kits  check  with auto electric shop (bosch agent)  use web feret search the net  ok  aussie-tech

thanks