section on resonant antennas misleading/got errors 
A lossless center-fed (needs to be mentioned) thin wire, lambda/2 (needs to be mentioned) dipole in free space (needs to be mentioned) has a feedpoint impedance of about 73 ohms, not 63 ohms. The discussion about operating at frequencies 20% 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 150 volts of feedpoint voltage" is meaningless; depending on the wire size, the feed voltage could take an arbitrarily high value.  wh