NEC-LIST: ex card near open wire end

Can anyone point me towards information why an ex card near an open wire end is a bad idea?

I've recently upgraded to using 4nec2 version 5.4.1 and it gave me a warning on this model. The waring:

Error: Wire 1, seg 1 (tag 1), EX-src: Not allowed near open wire-end.

Perhaps there's a more appropriate way to excite my antenna at the same spot?

Thanks in advance,

Rian Sanderson

The model:

CM GP Generated nec input
CM 802.11a antenna
CM
CM Using screen coords. Excite at first wire
CM dimensions in mm, scaled to meters with GS
CM
CM Rian Sanderson
CE
GW 1 1 0 0 0 1 1 0 .120
GW 2 1 1 1 0 2 2 0 .120
GW 3 1 2 2 0 3 3 0 .120
GW 4 1 3 3 0 3 2 0 .120
GW 5 1 3 2 0 2 1 0 .120
GW 6 1 2 1 0 3 1 0 .120
GW 7 1 3 1 0 2 0 0 .120
GW 8 1 2 0 0 2 1 0 .120
GS 0 0 0.004
GE
EX 0 1 1 0 1 0
FR 0 1 0 0 5220
RP 0 73 73 1000 -180.0 0.0 5.0 5.0
EN

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