drive-point current phase explanation

I'm trying to understand why the relative phases of the currents on two
identical,
electrically isolated, antennas in free space is not determined by the distance
between them. I am using the following NEC model:

* 2 identical half-wave resonant dipole antennas - each has five segments
* the two antennas are parallel to each other
* distance, d, between antenna centers is exactly 1000 wavelengths to avoid
any mutual
  coupling effect
* first antenna (transmit) is excited with 1 excited with a voltage source

Shouldn't the phase of the current at the drive-point of the receive antenna
lag the
phase of the current at the drive-point of the transmit antenna by
2*pi*d/lambda ?

I would expect the phases of the drive point currents on both antennas to be
the same
in this model since the separation distance, d, is an integer multiple of a
wavelength. However, I find that the phase of the current at the center of
the receive
antenna is about -94 degrees relative to the phase of the current at the
center of the
transmit antenna.

Can anyone explain this ?
 
Received on Thu Dec 21 1995 - 17:39:00 EST