You could use the default turret range setup. Maybe reduce the optimal ranges so to get 100% strenght you have to be close. And increase falloff range so the farther out you are the more the strenght drops.
I also still think changing the module to match the ship size makes sense. Small, medium, etc… so if some wants to put a medium on a frigate they can, but the cost will be high to mount it, but the strenght gain would be huge. A bit like the Neuts.
I look at the ships and think there is no one a small frigate should be effective enough to jam a battleship solo, it just doesnt have the power to support that concept. A group of frigates combining their ECM on one battleship sure. In solo like vs like should be equal, but increase target size the effectiveness of the jam should drop, and the only way to counter should be re-enforce the jam with more modules (at the cost of other modules and mounting requirements) or get another ship in to help.
I still wonder why CCP didnt think of these ideas/concepts before throwing this patch out, these are basic ideas and already in play for other modules.
The Oct balance pass topic about the ECM suggest changes is well pass the 2000 mark, and with many suggested options given, yet no response to any of them from CCP or CSM, instead you have CSM defending themselves.
With such a massive negative response youd think CCP would have held back on releasing the ECM change and come up a better solution (even if based on a community suggestion)