Washington, D.C. mobile traffic is probably the most spied in the world. Especially now when it's run by technological cavemen and overly confident techbros. Israeli, Russians, Chinese, French and everyone.
My father being a DXer and installer of a home-built Yagi and rotator system, I discovered this fairly easily. All he told me was to just guard the privacy of these people I was snooping on, because they were supposed to be private conversations after all. I never heard anything of substance anyway. It was one of the more boring surveillance activities of my misspent youth.
APNewsBreak: US suspects cellphone spying devices in DC https://apnews.com/general-news-d716aac4ad744b4cae3c6b13dce1...