I am doing a very amateur version of Tesla's experiment of using potential difference between positively charged sky ( due to solar wind) and negatively charged earth. I took a piece of cardboard. Stapled aluminum foil to it to use as antenna. Stapled stripped end of wire to this foil and hung it over about 10 feet. Then I took another smaller piece of cardboard and buried it in wet ground. I attached one stripped end of another wire to it. Now I connected a capacitor between stripped end of wire from ground and antenna. As per theory, the capacitor should charge and develope some voltage. But this is not happening. Can anyone tell me where I am going wrong?