Strategic Antenna

Summary
The Strategic Antenna is part of the game's Detection system, and functions similar to low-frequency RADAR, providing long-range detection of out-of-play units.

In exchange for being able to detect anything in range, it lacks the bearing and range accuracy needed to produce firing solutions for most weapons, with the possible and highly technical exception of nuke-armed cruise missiles. No, not actual missiles, but very small airplanes built to function as disposable carriers for the "tactical nuke" simple weapon.

Technical details
Default view range is


 * Above sea level: $6 + 0.006 y$
 * Below sea level: $\max \left( 6 + 0.06 y, 0.6 \right)$

Antennas only function above sea level. The additional view range for $n$ antenna pieces is

$0.06 n^{0.7} \sqrt{y}$

View range cannot exceed 60 map units, or about 3 grid cells.

Trivia

 * Although one might expect this thing to require a power source, it doesn't. It could perhaps be an entirely passive device, but then it wouldn't be able to identify islands and mountains. If nothing else, it could be a case of "keep it simple, stupid".