They are entirely ignorant of radio/tv technology.
Consider–
If they want to communicate with us– they could use radio/tv far more eaily than drawing crop circles.
If they do not want to communicate with us–they would notice all the UFO specials on the Discovery/History Channels, & amend their clandestine procedures & standards forthwith.
They like to fuck with our minds, man. They don’t care, they’re from outer space. The rectal probes don’t mean anything to them. It’s like tagging bears when you don’t even have a research program going on … you just like to watch them staggering off afterward, clearly trying to figure out what the hell just happened.
Although their spacecraft are built to travel vast distances at great speed, their designers are clever enough to build them to resemble weather baloons, meteors, Airbus 350s and other seemingly benign objects.
They can temporarily immobilise your car / plane / boat, as if by remote control, in order to abduct you.
It’s not just us humans that they like to probe, they have a thing for cows too.
They know how to see the universe for less than 30 Alterian dollars per day.
They never appear in front of skeptics. Obviously, this is because their highly evolved, sensitive telepathic minds cannot stand the harsh thoughts emanated by a skeptic.
UFOs famously ignore inertia. Therefore, they either have technology that allows them to ignore inertia, or lots and lots of padding.