yhan wrote:
I built my antenna with the help of this newsgroup and other articles
from the net. thanks to all. Now, the only problem is i am a little bit
confuse about impedance. (but still studying for it). how will i know
the impedance of my antenna so that i can buy a transformer or balun
that will match the ... feedline(is it the right term?). Is there a
standard formula for calculating impedance of a home-made antenna?

If you describe it, some kind soul may be able to tell you.
Is it single frequency or multi-band? Sometimes a 1:1 choke
is the logical choice for a "balun".

What a lot of us do is model our antennas to get an estimate
of the feedpoint impedance. A free version of EZNEC can be
downloaded from http://www.eznec.com.

Other free software available from:
http://www.btinternet.com/~g4fgq.regp
--
73, Cecil http://www.qsl.net/w5dxp

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