Why would it?
Unless you are using an antenna which requires an earth "return" to function, such as an end-fed long wire, an RF ground does absolutely nothing with regard to reception (or transmission) of radio signals.
If you use balanced antennas (dipoles, loops, quads, yagis, etc) or ground-independent unbalanced antennas (base-fed vertical with radials, etc), the RF ground performs no function. Your "return" is provided by the antenna design, and connecting or disconnecting to the earth makes no difference whatever.
I'm active, running high power, on 12 amateur bands from 160m through 70cm, and have never had an RF ground of any sort. I do very, very well on the air and have a QSL card collection that's so large (more than 75,000 cards from 321 DX entities) that I stopped collecting any -- out of room.
An RF ground can be helpful in some cases, but if you use current-fed antennas providing their own current return for the RF signal, as most of us do, improving station performance -- or reception -- is not a factor.