Based on Italian tech/telecom forums and user complaints, this refers to a specific issue with the mobile network operator in Italy.
simply means a Tre mobile phone antenna (cell tower/small cell). la bustarella antenna tre
literally means a small bribe or envelope of money, but in this context, it's slang used by users to describe bribery or preferential treatment —specifically, the suspicion that local administrators or condominium managers were paid off (a "bustarella") to allow Tre to install an antenna in a certain location, often without proper permits or against resident wishes. Based on Italian tech/telecom forums and user complaints,