Let see, Advanced Radar costs 500 metal, while Radar tower is 55 metal.
Advanced Radar tower has 4000 Elmo range, while normal one has 2100 Elmo range radar coverage. This means that 4 Radar towers (=220 metal) can cover roughtly the same area as single advanced radar.
Technically Advanced radar has the advantage of being possible to be twice as far from the frontline compared to the radar tower due to its increased range to cover the same area as Radar tower would, but that is hardly worth the price difference.
In conclusion, advanced radar could definitely use additional abities or price decrease as it is at least 50% less metal effective than just building bunch of radar towers.
Possible ability suggestions:
1.)Activable ability to reveal the fog of war in a small area within its radar radius. But this might trivialize scouting too much.
2.)Bring back more accurate radar wobbles.
3.)Give it also a radar jammer radius that is much smaller than its radar radius, but still able to cover itself and nearby units from enemy radars.