Topband: Receive pre-amp for Terminated Rx Loop

[OZ1AXG Flam]

Hello

Could need some more signal on the K9AY Loop antenna for 160 meters i put 
together. The signal strength is ok on 80 meter (loop is 26 meter). But on 
160 meter the signal is on the low side

Any recommendations, for desent receive pre-amp (e.g. +12 dB). I build my 
own control box - so a PCB for build in would be optmial,  but its also ok 
its an external  unit though ...

Regards
OZ1AXG Flam