Standoff

Jodrell Bank is the codename for one of the Halo 3 Downloadable Content multiplayer maps. It is described to be a smaller map than others, and is best suited for small Free For All games. This was one of the First DLC Maps to be announced by bungie, the other being Moonbase Alpha

This level appears to be named after the Jodrell Bank Observatory located in Macclesfield, England. Given it's name, the map may feature around a similar type of facility or perhaps even on the dome of a radio telescope itself.