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Here you go, a four element cap hat AP vs a 3 element cap hat AP.  the red line with the additional "tch" label is the three element cap hat.



  • As you can see, only a minor difference in performance, the four element cap hat has the edge on gain.
  • The angles of radiation are the same.
  • The four element cap hat elements are 25.3 inches long, three element cap hat elements are 33 inches long.
  • The three element cap hat has the edge here on SWR, but neither are particularly high, and if we really wanted we could adjust the four element cap hat and vertical length to compensate.
  • The three element cap hat is slightly more efficient over all, but that efficiency gain is not pointed in an optimal direction hence the lower gain result from above.

Anything Else?



The DB


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