It's my understanding and I could be wrong, that you won't be able to get the HD channels on a carryout with Directv. I also heard that Directv was moving towards getting rid of SD channel service in the future, but that could just be a rumor (and you know what rumors are like...)
I have DISH now and am able to receive HD service on my X1 Pathway which is similar in design to the G2, but the X1 is powered by the coax from the reciever and G2 requires a separate power cable with the coax.
Lanny, Retired GySgt USMC
2016 Vilano 365RL
2016 F350 CrewCab 6.7 Powerstroke DRW