QUOTE (psychophipps @ Nov 16 2008, 08:39 PM)

Except that a 100,000 volt charge can arc a full 10 inches and that other layer of uber-conductive paint on the opposite side of the wall is definitely more conductive than the air it would otherwise discharge into. Being someone who has done interior building construction and remodeling, the steel interior struts and supports are the same size as those typically found in houses (2 x 4s and the like), they conduct electricity just fine (as evidenced by the times I've shocked myself), and that they're still hollow to reduce the costs and weight of construction.
And you don't think that mega's haven't figured out that conductive paint effectively turns buildings into giant lightning rods? I'm willing to bet that there are several grounding points built into the structural walls to prevent a minor thunderstorm from causing too much damage.
A few other ideas to toss around:
As word gets around about your runners and their tactics other people start to copy them, forcing EVERYONE to come up with counter-strategies. The mega's throw money at the problem, reinforcing walls with radar absorbent materials, upping scanners and ECM at their facilities, etc. With an unlimited capital base you get all sorts of hi tech problem solving.
Gangers start erecting barricades along the outer walls of their hideouts (using steel drums, sheets, and so forth) that not only lessens the effectiveness of the radar but helps to stop or deflect bullets as well. Maybe they move further inside the abandoned industrial sites they love so much. Hell, they could go so far as to start hanging strips of aluminum in thick clusters in the outer sections of their buildings-- as sort of a poor-man's permanent chaff.
If you feel really vicious... maybe the EM frequency used by the ware gives the owner a tumor. Or the signals attract a particularly rare and bloodthirsty paracritter.
If worse comes to worse congratulate your runners for finding a good rules loophole and ask them to stop using it so you can all go back to having fun.