Where to Place a Resonator for Selective Frequency Amplification in Antenna Systems?

Hello.

I was wondering if someone could explain to someone with no electrical engineering background where would one place the resonator whose sole responsibility is to amplify sine waves at a particular frequency while ignoring other sine waves. Would this resonator be located by the antenna itself or at a location once the signal has passed through the transmission line to the receiver for example ? I hope I have not confused the technology and further hope that I've explained the question clearly. Please correct me wherever and ask any questions for further clarification.

NOTE: If this is not the correct forum for this question could anyone suggest a site that is better suited for this area of study.

Thanks in advance

The device you are referring to is a "filter", a circuit that allows certain frequencies through but blocks others. An "active filter" can also provide amplification of the desired frequency or frequency range.

A filter can be situated anywhere in the signal transmission line. If the transmission line is long, an active filter would best be situated close to the signal source (aerial) in order to overcome noise that may be picked up by the transmisssion line.
(Otherwise, it would also be amplifying any noise in that frequency range.)

But if this is a basic setup like a TV aerial, indoors is preferable both for convenience and weather protection.

it is both less costly and more efficient to place that filter a the lowest power point of the signal that is reasonable. look at the simple design of a 30's era am receiver.