The range would be limited to promote interactivity and counter play, ie making positioning and finding a window to use it a thing.
So its kinda like IR halftrack 2.0? It would all depend on range of Relay than, it would hard to balance and would probably end up in a state where its either OP and abused (hello IR halftrack) or UP and worthless
Right now Relay balanced by the fact it costs munition and you cant mindlessly spam it or you'll end up without HEAT shells, and if you spam HEAT mindlessly you'll end up with no recon. I think you're trying to fix whats not broken here.