2006 Honda Accord Radio Reception

I have a late model 2006 Honda Accord (the 2006 version with the LED brake lights). The radio signal produces a static interference sound at almost regular intervals regardless of what station I am on. However, it is only really noticeable when I am going faster than 15 MPH. At a standstill the radio signal is OK, but still not very good. The regularly occurring static sound is not noticeable when the car is standing still. How can I get this fixed?? I took it to the dealer and had them check the radio, but they could not find anything wrong.

With the radio you may not find anything wrong, but the antenna cable where it joins with the antenna, maybe. I say this because you only hear the interference when the car is moving.