Unfortunately this isn't strictly true anymore (and hasn't been for a few years). All areas of surge have a quadratic fall-off zone around the high point to sol

Unfortunately this isn't strictly true anymore (and hasn't been for a few years). All areas of surge have a quadratic fall-off zone around the high point to solve just this. You'd have to walk some distance for this to be helpful. It may work near a major avenue or political boundary or an event like a parade where there are "dispatch walls" set up or where there are two city areas that meet - think Reno / Tahoe.