Larry D wrote:
Can anyone tell me the impedance I can expect to see,
also any tips on matching it? Thanks!

The VERT1 vertical that comes with EZNEC is 1/4WL on 40m.
It will be 5/8WL on 17m. (7.2 * 2.5 = 18) EZNEC sez the
feedpoint impedance on 17m will be about 100-j470 ohms.

A loading coil is usually installed between the base of
the antenna and the radial system. The coax braid is
tied to the radial system and the coax center wire is
tapped down on the coil at the 50 ohm point.

Rad| coil
Gnd-------+-////////---------------5/8WL----------------
Rad| ^
|
XMTR-----------+

If you don't mind a relatively low SWR of 2:1-3:1, use good
coax, a standard base-loading coil, and your tuner at the
transmitter.

There is plenty of 5/8WL information for 2m antennas
in the ARRL publications and antennas are scalable.
--
73, Cecil http://www.qsl.net/w5dxp




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