EWR LCL CTLR CLAIMS THERE IS A DEAD SPOT IN TWR RADIO RECEPTION WHEN TFC IS ON AND AROUND RWY 04L. RPTR STATES THIS PROB HAS PERSISTED FOR OVER A YEAR.

Narrative

I WAS TRAINING A DEVELOPMENTAL ON LCL. HE CLRED ACR X FOR TKOF. I OBSERVED A VEHICLE XING THE DEPARTURE RWY 04L DOWNFIELD WITHOUT PERMISSION. I CANCELED ACR X TKOF. NO REPLY. I CANCELED TKOF AGAIN. NO REPLY. VEHICLE WAS NOW ON THE OTHER SIDE OF RWY 04L AND ACR X CONTINUED TKOF ROLL. ACR X NEVER HEARD ME IT SEEMED. NEWARK HAS KNOWN ABOUT THIS DEAD SPOT IN XMISSIONS FOR OVER A YEAR. A STATEMENT ON OUR ATIS EVEN ADVISES ACFT TO USE UPPER ANTENNAE. EVERY DAY WE HAVE ACFT; MOSTLY B737; THAT NEVER ACKNOWLEDGE A TKOF CLRNC; BUT ROLL. WE CAN'T HEAR THEM AT TIMES AND THEY CANNOT HEAR US AT TIMES. THIS FREQ PROB CAN SOON LEAD TO MAJOR LOSS OF SEPARATION. I DO NOT KNOW IF AF IS GOING TO EVER FIX THIS PROB OR NOT. WE EVEN LOG IN THE DAILY LOG EVERY ACFT THAT TAKES OFF WITHOUT US EVER HEARING AN ACKNOWLEDGEMENT. I OBSERVED THIS SIT IN TIME TO CANCEL THE ACFT'S TKOF SAFELY; BUT DUE TO THIS EQUIP PROB; I WAS NOT ABLE TO DO MY JOB. LUCKILY THEY MISSED THIS TIME SINCE THE VEHICLE WAS FAR DOWN THE DEPARTURE RWY AND WAS ACROSS THE RWY IN NO TIME (APPROX 7000 FT AWAY). THIS PROB NEEDS TO BE ADDRESSED AS SO ON AS POSSIBLE BEFORE THERE IS A MAJOR LOSS OF SEPARATION.