Actually got a deadline to deal with so I cannot give this the attention it deserves right now, but the critical aspect here is not really anything to do with weapons. It's sensors and communications equipment. How far you can disperse a given organisation is pretty much a function of the four critical freedoms of Fires, Observation, Communication and Manoeuvre. Your ability to do those things in time and space will define how far you can disperse and how quickly you can concentrate.

EG- A dismounted Coy with Spike ATGMS and a Man packed UAV can in theory cover a 3.5km x 3.5km area in terms of an anti-armour mission. Reality is somewhat different!