[Smedley]

Actually, yes. No way of reliably taking over control (assuming the latest of RC control tech), but the frequencies of standard RC equipment are well-known, can be monitored, and can be jammed.

[Yo-Yo]

Most RC control systems are now on the license free 2.5 GHz band and use frequency hopping spread spectrum. They are designed to be jam-resistant so dozens of flyers can be in the air simultaneously without needing frequency coordination.

The only way to jam is to jam the entire 2.5 GHz band that also is used by Bluetooth (and cordless phones, Wi-Fi, etc.)