So I was reading some fiction about where the character bought a television and "and the fanciest pair of rabbit ears available. The rabbit ears even had a large tuner knob built in to it that I'm sure didn't do a damn thing for reception but man did it ever make it look hi-tech."
OK now this is obviously a receive only setup with the old ntsc television standard, and I remember owning a set top antenna with a knob or two I know the first one was 300 ohm (I took that one apart), latter ones may have been 75 ohm. but I never understood what the knob was supposed to do or how it worked. the one I took apart had (if my fuzzy memory is right, this was at least 15 years ago) a hybrid mutli-throw switch where both poles were on opposite sides of the sweep arm and a bunch of induction coils. I don't remember seeing any capacitors, but I have slept since then.
So what is this supposed to do and how does it work?