On certain maps, the signal jammer has a greater vertical distance. So if it's not in the laptop room, go to the room above it.They need to nerf the range of the Signal jammer. It's currently too powerful, doubly so since you can spam 4 of them. We killed the entire enemy team, moved into the objective room and looked the entire time and never once heard the sound of a signal jammer and lost... Doesn't feel fair.
Shoothouse appears to be the opposite. Depending where it spawns (like the room with the couch and two desks) you can actually place it near the catwalk.