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Determining the impedance of an unknown component

If I have an antenna and I wish to measure its impedance. I have two impedance values, Z=125.52-j207.36Ohms and Z=8.14-j39.6Ohms, and I do not know which one is correct/ which one applies to this ...
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At what frequency will the reactance of a 1μF capacitor equal to the resistance of a 2kΩ resistor?

Here is my work: \$ R = 2000 \Omega\$ \$ X_L = 2 \pi f L = 2 \pi (1 \mu F) f = 6.28\mu F(f)\$ \$f = \dfrac{2000 \Omega}{6.28 \mu F} = 318.471MHz \$ Does this look right to everyone?
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