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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Well I guess the simple explanation for the first questions is this: If the antenna is too short, it won't receive the entire wavelength. If it's too long, the radio waves that it receives will cancel eachother out.
The problem with unshielded twisted pair (and shielded also) is that the characteristic impedance is not uniform, so you can't get a proper termination. At low frequency it works OK but for high frequency, use coaxial cable.
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