My car radio crackles when I listen to AM/MW. What can I do to solve this?

It's worse when it's been raining. Ive tightened the aerial mount but I still get the same problem when it's wet. I don't get any problem listening to FM.

Answers:
This is the whole problem with AM. AM gives a station the ability to bounce it's signal off the atmosphere and back down to earth, which gives it a much larger listening area. The problem is, the lower frequency that AM uses is easier to be interfered with by things such as stray electrical signals by powerlines, as well as by lightning, which ionizes the atmosphere. FM uses a higher frequency that cannot bounce off the atmosphere, so it's listening area is smaller, but it is also not affected by stray electrical signals nearly as much as AM, which is why so many music stations use FM, for a clearer signal.
That's the nature of the beast, and the reason that we've gone mostly to FM
Install MP3 Player.
Get a DAB radio..
Buy a digital radio
get a decent aerial you retard!
Stop listening to AM!

The signal is really suitable for portable devices as it requires the aeriel to be oriented towards the transmitter. Some car radios are better than others but you'll never get the same quality as FM (or a permanent AM installation)
Fit fliters to anything electrical that may cause interference, wipers are a big cause of it.
get a noise suppressor they mount on to wiring its because u need one of them they sell at auto shops it is cause u are not got good shielding on your ant wiring cable is picking up electric currant from engine and the ohm rating is low in shielding the sheilding is the plastic they wrap the wires that lead to the antenna
Try replacing the coax lead between the aerial and the back of the radio. Make sure the radio is properly earthed to the chassis. Some radios used to have a small variable capacitor just inside the rear case which you could turn with a small screwdriver to tune the aerial for max signal.
Notice the only two posters with "thumbs up". They know.
That is normal. Step into the future and use FM or buy XM.
Turn your radio off
get a better ariel

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