Hey, I'm looking for the story where Sheppard is back on Earth missing Atlantis. Somehow the gate opens and Atlantis sends through a message or just a nudge to him. SGC figures it out and everyone's astonished at their connection. Probably McShep, I think?
Found by ameshinju! Thanks. Going Home by Titan5:
http://www.fanfiction.net/s/3825613/1/Going_Home