Have you tried to bridge the remote and battery positive supply at the AMP wtih all RCA and speaker out put connected??
The supply to the remote out of the deck is a 12v constant that cant draw more than 100ma.
If you connect it to the antenna the signal is a pulse and wont trigger tha AMP properly.
If you really want to, you can connect the remote wire to the accessories behind the deck for a temporary fix.
As for the earth wire, you need to connect it behind the head deck as the earth is being traced through the antenna at the moment.
This maybe the result of no out-put from the remote wire....
Last case scenario, your head unit isnt putting out a remote signal.
Goodluck sweetheart! LOL