The Brazilian military has tested radios suited for the Amazon jungle.

Rockwell Collins demonstrated its HF Cellular system during a demonstration in the second half of 2015, according to a company news release. The goal was to improve the reliability of communications in the Amazon.

"Rockwell Collins also demonstrated the ability to not only provide voice and data transmissions but to also provide real time position reporting in the Amazon region," the company said.

"Establishing reliable and secure long distance communications in remote areas of the Amazon region is a challenge for the Armed Forces," said Marcelo Vaz, managing director of Rockwell Collins do Brasil. "The HF Cellular system has demonstrated the capability to augment the existing HF infrastructure, allowing troops to connect with command centers more than 2,400 kilometers away using their existing manpack HF platoon radios."