RadioBanter - View Single Post - Suggestions please

Cecil Moore[_2_] · June 28th 07, 01:44 PM posted to rec.radio.amateur.antenna

wrote:
By using a vertical wire of a suitable magic length (7.2, 8.8 or
11.8m) supported by the fishing pole, I can get the LDG tuner to
provide a good match on all Amateur bands from 80m upto 6m as the
impedance presented to the tuner is just within it's (slightly
limited) matching range.

When a vertical monopole length is much longer than
5/8WL, the take-off-angle increases and much of the
radiated RF is lost into space on the higher
frequencies.

For instance, on 6m using the 7.2m monopole, the
take-off-angle is ~56 degrees.

7.2m is ~5/8WL on 12m, not good for 6m-10m.
8.8m is ~5/8WL on 15m, not good for 6m-12m.
11.8m is ~5/8WL on 17m, not good for 6m-15m.
--
73, Cecil http://www.w5dxp.com