I believe this is H003XC250 in Houston at the West Park Toll Road and Beltway 8. Sorry for the crappy pictures, I was driving 75 MPH and held down the shutter on the my EVO LTE. Wish I had my DSLR and wasn't driving.
Always wondered how they worked on antennas a top transmission lines. Not for the faint of heart, but I wouldn't expect the gentlemen who do this for a living to be scared of much. I'm especially fascinated with this as I am an Electrical Engineer (Don't mess around with HV though). Because of this site, all I do on my commute now is stare at cell towers and power lines.