| I plan to order the large type 31 toroids for my yagi.  I was also  thinking 
about them for my half sloper, but then I began to wonder if a choke is 
relevant for this antenna.  After all, my tower is the main part of the half 
sloper (connected to the coax shield); the coax runs down the tower (with about 
15" standoff). Does additional coupling from the tower to the coax shield 
introduce additional noise?  (My primary concern is reduced receiver noise.)
I realize there are various opinions about half slopers, but mine works 
modestly well on 80 meters and so-so on 160. It is attached at about the 38' 
level of a 55' tower. It is better than nothing and is better than a terminated 
dipole (grounded resistors at each end) with the top at about 50'.
Bill - W2WO
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