It's the same helicopter that Rick saw on his way into Atlanta. All those scenes are flashes of how the "herd" comes together and moves out of Atlanta and into the country and eventually end up by the farm. When they are in the woods they are actually moving past the farm until Carl shoots Shane.
You might ask how did they get out there so quickly but the show isn't day by day. When they first take Randal back to the farm Hershel says he'll be layed up for at least a week, probably longer. The next episode he's ready to go, so who knows how much time has passed, at least a week, but I would suspect more as he's fully heeled. Not to mention the walkers don't need to stop and rest.
I am guessing they've been on the farm for months.
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Long time caller, first time listener
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