Radio Interference

[davethecabbie]

can anybody help with this problem.The interference is not on the car radio but on my taxi radio.we have some dead spots in our area where i get a slight level of crackling but not enough to be a problem.However when i have to have the headlights on the level of interference increases to such an extent it is virtually impossible to hear what is being said on the radio.It doesnt happen with the side lights on,i have tied three different radios and two different aerials all to no avail.Apart from making it difficult to work in the evening the noise is driving me mad so any suggestions would be much appreciated.