On Wednesday, August 22, 2012 7:47:07 PM UTC-5, amdx wrote:
resonant antenna [′res·ən·ənt an ′ten·ə] (electromagnetism)
An antenna for which there is a sharp peak in the power radiated or
intercepted by the antenna at a certain frequency, at which electric
currents in the antenna form a standing-wave pattern.

Seems that these conditions would also exist for any conjugately matched non-resonant standing-wave antenna.