"professorpaul" wrote in message
...
I only want to cover 144 and 420, nothing in between! Just for LEO
satellites, where the uplink is on 144 and the downlink is 420, or vis
versa.

then forget all the complications of log periodics and just make 2 simple
yagis on the same boom. that is the common method of constructing
directional satellite antennas. same boom too complicated, just make 2
separate ones and mount them on a cross arm a few feet apart.