Zzzap can jam and detect radio signals 400 miles away

“Yeah. And it’s not so much a robot as remote controlled. Which means somebody east of here is flying this thing.”
“And watching us,” said the hero. He pointed at the lenses on the metal basketball. “They can see us through those, right?”
“Technically, yeah, but I’ve been jamming its transmissions since we got close to it. We don’t know who’s on the other end of this thing.”
St. George glanced at his friend. “What makes you say that?”
The wraith pointed east. “I can see their transmitter over there. It’s about four hundred miles away.”

Excerpt From Ex-Patriots, pg 94-95
Peter Clines
https://books.apple.com/us/book/ex-patriots/id585738393