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== Considerations in Design == === resonance / swr === === Q === === Impedance === === Common Mode Current === === Velocity Factor === == Math == === 492 / Freq in MHz === Calculate length for an inverted V antenna. === 1005 / MHz === Calculate length for a full wave loop antenna. == Talking Points of Experience == Loading coil to simulate length, but inefficient and generates heat, doesn't handle high power well. DC grounded antennas are ideal: prevents static build up on antenna Precision in element length becomes more significant at higher frequency Understand how capacity hats impact resonance == Impedance Dipole vs Inverted V == A dipole in free space should have about 72 ohms of input impedance. As you move the poles down to form and inverted V the impedance lowers. A folded dipole needs a 4:1 balun

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