Question about Radios and Antennas menu

I'm still using 3.24.10,0, but on that and previous firmware it was the maximum distance the node would try to connect to stations.  It is not a sharp boundary, but the radio will tend to ignore signals from beyond this range.  I know since having this setting wrong (10 m for a 17 m path) really compromised some of my links.  They might work sometimes and then not others.  Once I read (in the old docs, the ones that are now gone) what this setting is for, I pay attention to it and the previously poor links are now OK.    Lee