Is their a way to boost a 2.4ghz signal between 2 itmes?

Is their a way to boost a 2.4ghz signal between 2 itmes?

I just bought a wireless spy camera that runs at 2.4ghz t spy on my son who I believe is a heroin dealer. I need this camera to hear and see things but the signal just isnt strong enough to produce static free sound or video. Is there anyway I could get something to make this signal between the camera and the signal receiver stronger? I cant unscrew the current antenna from the receiver to put a stroner on on so I dont know what to do. Please help.