K7ITM wrote:
When that physically long but electrically shortened to resonance
antenna is excited and a standing wave pattern develops, what is the
phase shift of the current through the loading capacitor? Is the
standing wave current on the two sides of the capacitor different, in a
manner similar to how it's different in a loading coil?

In order to answer the question, one has to understand the
physics of standing waves. Most people don't understand the
physics of standing waves. Understanding the physics of a
capacitor embedded in a standing wave environment is pretty
much moot if one doesn't understand the physics of standing
waves. Please let's take first things first.
--
73, Cecil http://www.qsl.net/w5dxp