Crimean Air Defense degradation summary - Kyiv Independent reports:
“Ukrainian forces struck around 15 air defense systems in Russian-occupied Crimea over the past two months, Ukraine’s Center for Strategic Communications (Stratcom) reported on June 17.
The Ukrainian military recently hit several S-300, S-350, and S-400 air defense systems, according to the statement. Ukraine also struck more than 15 radar stations and over 10 control centers stationed in Russian-occupied peninsula.
The military sites were located in Crimean settlements – Chornomorske, Tarkhankut, Yevpatoria, Saky, Donske, Belbek, Sevastopol, Alushta, Dzankoi, Mysove, and near Ai-Petri peak, according to the map published by Ukraine’s Center for Strategic Communications...
...Air defense losses apparently made Moscow nervous enough to move the latest S-500 systems to the peninsula, Ukraine’s Military Intelligence Chief Kyrylo Budanov said.”
As I and others suspected, it appears to house a GPS antenna for aligning the weapon's GPS/INS prior to weapon release.
https://x.com/John_A_Ridge/status/1802786533864284401
Something like this could be adapted to HIMARS launch vehicles that are used to launch GLSDBs.