On the receiver code, you must change your ReciverPIN to PORTA.0, Counter must be a Byte, also baudrate must be the same on both sides.

On the transmitter side, there's a missing DEFINE OSC 20.

I will suggest you to test it without the RF modules for now. Once you have something workable, just add the modules.

Make sure the PIC config fuses are correctly set. At least HS_OSC and LVP_OFF.