section on resonant antennas misleading got errors a lossless center fed needs to be mentioned thin wire lambda needs to be mentioned dipole in free space needs to be mentioned has a feedpoint impedance of about ohms not ohms the discussion about operating at frequencies above the first harmonic seems to assume that the radiation resistance would be unchanged in fact it is increasing the radiation resistance is a function of the ratio wire length wavelength so the feedpoint voltage would go up even in complete absence of a reactance also the reactance of an off resonance doublet depends on the diameter of the wire a statement like about volts of feedpoint voltage is meaningless depending on the wire size the feed voltage could take an arbitrarily high value wh