Topband: Placement of RX feedline chokes

[Herbert Schoenbohm]

I have always used a 3 inch ferrite (TDK 9930) choke with  for each 
Beverage RG6 feedline (13 turns) near the shack entrance.  There is a 
common ground and on the remaining RG6  going to the radio (20 feet or 
less) I have another 3 inch ferrite with another 13 turns of RG6.  To 
better describe they are for the RG6 a coil, a common ground, and 
another coil.    It has come to my attention by a seasoned topbander 
that I have this all wrong and the decoupling coil should be close as 
possible to the Beverage transformer.  He reasoned that the long RG6 
cable (some 500 feet long)  couple random pickup right back into the 
Beverage transformer and could also reduce the side lobe rejection from 
the Beverage itself. So where is the best placement for for a feed-line 
choke?

Please share with me your thoughts on this.  Thanks

Herb Schoenbohm, KV4FZ