[amsat-bb] Masthead RF preamp suggestions?

Hello all,

I am seeking suggestions for reasonably low-cost (but reasonably effective) masthead preamps for 2m and 70cm to go along with a pair of omni QFH antennas. Kit or commercial is fine.

Also any thoughts on how effective preamps might be on omni antennas vs highly directional antennas.

Thanks -

73 Ken VA7KBM