It could be nice to have a short-range buildable radar that would show a dot (like the radar) on the target position.
For exemple: (on ATCS)
A human builds the radar.
An alien goes in the tunnels.
Once the alien reaches the radar’s registration range it shows a dot on it’s current position following the alien as long as it is in range of the radar.
We could then have an upgraded version which could show a letter (with a + sign if the alien is advanced.) or an icon instead of the dot following the same logic from before. The range could also be increased when we build the upgraded version.
Only one radar could be built or building additional ones would only be possible right next to the first radar and would boost the radar range by a few units(maybe 1 or 2 per) with a little boost of maybe 3 or 5 when attaching 4 short-range radars to the Augmented short-range radar. The maximum range could be of maybe 20-30 units or something in the range of these depending on the map size.