wrote:
WHAT IS THE "COIL" USED TO MATCH A 5/8 WAVE VERTICLE? i MEAN WHAT IS IT
MADE FROM AND WHERE DO YOU GET THEM?

The end feedpoint impedance of a 5/8WL vertical is about
150 - j600 ohms. The coil is used as a loading coil to cancel
that capacitive reactance and is usually tapped and fed at
the 50 ohm point. Construction details for a 2m 5/8WL mobile
antenna are contained in "The ARRL Antenna Book" which is
an excellent first book on the subject of antennas.

Here's what EZNEC sez about a 1/4WL Vs a 5/8WL vertical.

1/4WL 5/8WL
-0.14 dBi at 26 deg. TOA 0.1 dBi at 26 deg.
-0.75 dBi at 17 deg. 1.4 dBi at 17 deg. TOA

Whether that 2 dB advantage at 17 deg. is worth all that
extra effort depends upon what kind of operating you do.
It can make a difference for CW DX.
--
73, Cecil http://www.qsl.net/w5dxp


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