HF based high-frequency trading.. fascinating. Here’s a second more detailed article.
Traders appear to be testing the idea of using shortwave technology to convey data between the CME facility and key exchanges around the
globe — a few millionths of a second faster than rivals. That can be the difference between winning and losing in high-frequency markets, where the ferocious battle for being first continues to escalate.
Source: HFT Traders Dust Off Century-Old Tool in Search of Market Edge – Bloomberg