The Otherworld is also a planet, with many places resembling Earth before Tang Mo's crossing. Therefore, based on the principle of higher vantage points providing wider views, this rule applies in the Otherworld too.
As a result, radars need to be mounted on masts to augment their detection range. However, no matter how much you increase it, the height of the mast is limited.
The same logic applies on the ground; even though you can choose higher places to set up radar stations, blind spots caused by the terrain are unavoidable.
In this situation, having aircraft carry powerful radars in the sky becomes an excellent solution: installing a radar at an altitude of eight thousand meters is an exciting prospect!
However, this design needs to solve several problems, which are trivial for Tang Mo, yet extremely challenging for other countries.
