ARRL mentioned this stuff in June 2018, then crickets. The second link on ka7oei's page, a 2018 discussion among hams, names a few of the perps' ID's. It said

ARRL mentioned this stuff in June 2018, then crickets. The second link on ka7oei's page, a 2018 discussion among hams, names a few of the perps' ID's. It said 'WJ2XGD' was the only one licensed on 20m.[0] Quote: 'Emission bandwidth shall not extend beyond the bandlimits' = 14-14.99. They're -not- required to ID themselves [Section 5.115] (an eyebrow-raiser).[1] [0] https://apps.fcc.gov/els/GetAtt.html?id=204018&x= https://apps.fcc.gov/els/GetAtt.html?id=204018&x=. [License to M-Wave Networks LLC, Illinois] [1] https://forums.qrz.com/index.php?threads/ham-radio-mentioned-prominently-in-high-frequency-trading-story.617581/ https://forums.qrz.com/index.php?threads/ham-radio-mentioned... This long, archived page about HFT tech briefly considers the HF option considerations (search for 'HAM radio') [2] [https://web.archive.org/web/20171012010437/https://meanderful.blogspot.in/2017/05/lines-radios-and-cables-oh-my.html https://web.archive.org/web/20171012010437/https://meanderfu...]