Topband: 160 meter G5RV

[DnEMoth]

My brother W2NFK just purchased a G5RV MAX 160-10 meter antenna and when he 
 transmitts the RF is getting back into the shack making for RF burns on 
the  mic.The transceiver is a K'wood TS 440-SAT with the built in tuner. 
Anyone have  any ideas for a RF choke to stop it. Reply off line so not to 
start 
a long  line on here.TNX
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UR RST IS ... ... ..9 QSB QSB - hw? BK