From the office/owner's apartment of the only motel in a town in Central Texas. The town, population of about 2,000, had a little square with knick-knack stores and restaurants because it was one of the only stops between the federal detention center 80 miles to the west and Austin, 100 miles to the east.
I'd covered a district game that night where the home team lost in overtime on a blocked extra point. The town had a weekly paper, and I'd talked to their editor about using the wireless signal to file. I parked outside of the paper (in the town square) before the game to check it out and voila, beautiful wireless signal.
Went to the game, about five miles out of town, wrote the story in the parking lot when they kicked me out of the stadium, then drove back to the paper. Turned on the laptop there - zip. No wireless signal. I tried turning the modem on and off, but the people at paper apparently unplugged the router when they left for the evening. Awesome.
The two gas stations in town were closed, so I figured I'd see if the only motel had wireless. I wandered into the office, because even though no one was there, it was lit and obviously open. I couldn't get a wireless signal, and right when I was about to give up and call in to dictate, the owner came out through a side door. I explained that I was just at the game and needed an internet signal to send my story. She told me her son just played in that game, and wasn't it awful, and of course I could file from there.
She brought me into a three-bedroom living area built into the motel office and let me use the family's personal ethernet line to file the story. The kid, one of the linemen who allowed the blocked extra point, sat in the corner glowering at me the entire time, and I don't think her husband ever looked up from SportsCenter. Got my story sent and made my 100 mile drive back to my paper.
It was really stressful at the time, but a fun memory.