The Brazilian government is planning to install anti-drone antennas on the Oscar Niemeyer-designed Planalto, Alvorada and Jaburu palaces in Brásilia, which would disrupt the clean form of the modernist buildings.
Brazil's Institutional Security Office (GSI) is planning to place a 1.5-metre antenna on top of the Planalto Palace and five-metre antennas on the Alvorado and Jaburu palaces in Brásilia to protect the area from drones.
The move follows a previous plan for taller antenna that was turned down by Brazil's preservation agency due to the impact they would have had on the buildings.
Iphan under pressure to approve plans 
The current proposal was sent to Brazil's National Historical and Artistic Heritage Institute (Iphan) in June, according to Brasília-based website Metrópoles. Metrópoles reports that Iphan, which hasn't yet approved the proposal, is being pressured by the government to do so.
GSI had contracted a company to install the system for detecting and neutralising drones, which it says are "becoming commonplace", in the area around Brásilia's Planalto, Alvorada and Jaburu.

The latest proposal came after the government's first plan was blocked by Iphan. This had entailed installing larger antennas on all three buildings, with a 20-metre-high antenna placed for the Planalto Palace's roof, a 10-metre-high antenna added to president Jair Bolsonaro's Alvorada residence, and a six-metre-high antenna set on the roof of Jaburu.
All three palaces were ...