tracking system

I have found plans for a few tracking becon trantmiters but no recivers.
They say just listen to your radio for the silence, but, for me it is just not good enought.

i was think some coud make/help me find some plans for some thing that mesures the strength of a serten frinceys (sorry for bad spelling) in a bar grath. it is also desirbele to have a switch of some sort to decrese incomeing signel strength, also nice to have a cristel ear peice to make sure im picking up the right signel

thanks in advance