about driven yagi antennas

hi guys..
what happens to the feed resistance of an antenna when the reflector and the director are placed on either side of a dipole?
what happens to the beamwidth when the number of directors are increased?
what is the approximategain of a three element parasitic array?
a circular polarised yagi enables the receiver to obtain signals from...?

it generally lowers the feedpoint impedance

it narrows

6dBi

commonly used for satellite reception. for CP there will be 2 crossed yagis on the boom and they will be fed out of phase


Dave