[Dave Loudin]

Originally Posted by dprljackson

I guess I don't really understand antenna gain. Being measured in decibels, does that mean a 3 dB increase corresponds to a doubling of the signal strength at the output of the antenna? If so, would that mean that doubling the distance from a source would result in a signal strength that is 1/4 as strong and therefore you would need an antenna with a gain that is 6 dB higher to compensate?

Thanks,
David

You are correct about decibels. However, the field strength of an electromagnetic wave decays by the square of distance, not linearly.