Ivy Iverson wrote in a message to Miha Valencic:
 II> ERP means Effective Radiated Power.  It indicates how much
 II> power your antenna WOULD be if you were using some standard
 II> antenna, such as a dipole.  The gain comes from the design
 II> of the antenna.  For every 3 dB, (DeciBels), of gain you
 II> EFFECTIVELY double the power.  So if you feed 5 Watts into
 II> an antenna with 3 dB of gain, your EFFECTIVE power is 10
 II> Watts. It's a logrithmic sale, so if the gain of the antenna
Yes, because it is directed... It takes energy from where it is not needed 
and directs it to single direction, therefore you have gain. I understand 
now. OK, thanks for the explanation. BTW, you don't get my Netmail, do you?
\M 
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