yhan wrote:

Greetings,

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?

thanks in advance,

ian

Impedance is very complex. As mentioned in another reply the easiest way
is to measure it. But, that post did not give advice on how to measure it.

Contact a Ham [amateur] radio operator/station in your area. Once found,
ask if [s]he knows someone who has an antenna analyzer. Most Antenna
analyzer owners, they cost about $200 to $300 USD, are willing to make
the measurement for you. Most Ham clubs have several people who own such
instruments.

What kind of antenna did you build? If it is a 'standard' type we can
give you a fair estimate right here on r.r.a.a.

Ham Op