If you don’t mind a followup question, what’s happening when a signal clears up if you touch or just hover near an antenna?
That can be for a few reasons…
In some cases you’re tuning (or detuning) the antenna capacitively.
On other cases, like if your tv gets interference when you’re standing in part the room, there may be standing waves causing interference, as the rf is bouncing around your room.
To further your point, theorically, there is a voltage potential between any two objects. That’s the capacitance. Better conductor, for the same surface area, create a bigger potential.
So when you tune/detune a signal with your presence near the antenna, it is because you are close enough to the antenna that the potential between you and the antenna affects the filter of the signal.
Sorry, your comment doesn’t make sense and doesn’t seem correct to me.
Yes there is a capacitance, but capacitance isn’t “voltage potential”. Capacitance is a ratio of coulombs per volt. Anyway, that’s beside the point.
There is capacitance and it’s defined by geometry.
“The potential between you and the antenna affects the filter of the signal”
You’re not adding potential to anything, nor are you affecting any filters.
Any capacitance you add will change the impedance of the resonant antenna. You get maximum power transfer when the impedance is matched.
Another way to look at it, you’re changing the resonant frequency.
