The team is desperate to climb up the standings after a mediocre first half of the campaign.
But McGrath says recent displays, including Thursday's exciting home win over Nottingham in which the centreman scored a brace, has had a big impact.
"I think it is a big confidence boost for us, we weren't too happy with our last five games segment, beating a good team like that is definitely very positive for us" he said.
The goal was now to head towards the top four and finish the 29-games left with a spring in their step pre-Play Offs.
Hear the full interview here.