Can the human body influence electronics?

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I've never been to this forum before but I was googling the hutchison effect and also info about radio waves and the human body and that's how I found this place. I've read a topic dating back to 2004 and made me wonder if the human body can influence electronics like causing interference and stuff like that. I myself experienced this a couple times, at a certain spot and by raising my hand in the direction of my TV antenna I could cause interference at will from moderate to even make the TV go totally black without reception, all this by just willing the TV to get interference. Now the thing is, how does this stuff works? does the human body emanates radio waves too? and why does it work only in certain days?