FLC CLAIMS BWI ATIS IS DIFFICULT TO RECEIVE AND THIS CAUSED THEM TO OVERSHOOT AN INTERCEPT RADIAL.

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I DO NOT EXACTLY REMEMBER WHAT ALT WE WERE AT; BUT I BELIEVE IT WAS FL230. ON A VECTOR TO INTERCEPT THE OTT2 ARR N OF RIC. ASSIGNED SPD 300 KTS. ASSIGNED INTERCEPT HDG 040. I TOOK THIS MOMENT (JUST AFTER WE RECEIVED THE INTERCEPT VECTOR) TO GET THE BWI ATIS. AS USUAL; THIS ATIS IS RECEIVED WITH GREAT DIFFICULTY; DUE TO EXCEPTIONAL INTERFERENCE OF OTHERS ON THAT SAME FREQ. IT TOOK ME 3 FULL TIMES BEFORE I HAD ALL THE NECESSARY INFO. AFTER THE SECOND MESSAGE I LOOKED UP FOR A MOMENT TO SEE THE CAPT TURN QUICKLY TO THE L AND NOTICED THAT HE HAD FLOWN RIGHT THROUGH THE 018 DEG RADIAL. I DID NOT KNOW IT AT THAT TIME; BUT AS HE LATER TOLD ME; HE HAD ACCIDENTALLY FLOWN THROUGH THE RADIAL AND RECEIVED A 330 DEG HDG TO REINTERCEPT; WHICH HE DID ACCORDINGLY. SINCE THE ATIS MESSAGE OF BWI IS ALWAYS QUITE LENGTHY AND UNREADABLE DUE TO THE INTERFERENCE; I WAS FOR SOME TIME UNABLE TO ASSIST THE CAPT IN HIS FLYING AND NAV DUTIES. I SUGGEST A DIFFERENT FREQ AND SHORTER ATIS COULD ALLEVIATE THIS PROBLEM. ANOTHER POSSIBILITY IS THE USE OF 127.8 ON THE GND AND A DIFFERENT FREQ FOR THE ARRS.