Re: Bring it On
I'm unsure whether a directional RF antenna can be realistically made small enough to locate the RF source within something as small as a Robot Wars robot but looking at things like RF Source Seeking drones suggest that with a dish antenna all you have to do is wave them at the source until the signal is strongest and Target Acquired.
Not sure how practical this would be but smashing the radio with a spike is not E-Warfare.