Topband: Center support on K9AY Loop

[Donald Chester]

Looking over both QST articles, it seems to me that the K9AY loop is nearly 
identical to the diamond or delta version of the flag/pennant.  The main 
difference is the location of the feed point and termination resistor, the 
termination resistance, and the grounding point with the K9AY loop.  The 
horizontal space is nearly identical (about 30 ft.), but the K9AY loop 
requires a taller support (about 25 ft. versus about 15 ft).  I may 
construct one of these antennas,  but instead of two loops 90 degrees from 
each other and a complicated switching scheme, I think it would be simpler 
to make the whole thing mechanically rotatable.  The dimensions don't seem 
prohibitive, and that way you could could find the maximum  null for local 
noise or QRMs much in the same manner as with the well-known rotatable 
shielded loop.

Any comments on how these two antennas compare in performance, by someone 
who has actually constructed and tried both?

Don K4KYV



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