Sometimes, the problem is obvious: your antenna is broken or missing. Sometimes, it's more subtle: your radio reception (particularly on the AM band) is weaker than usual and getting worse.
Either way, you need a new antenna. This stainless steel antenna is a convenient solution for a wide variety of vehicles. It features a 31" detachable mast and a 72" cable. This model is also available in Black. Warranty: 60 days.