NM5K

Dunno, I think it varies. But I sort of agree with Tom, I think it's
fairly constant across the coil.

MEASURE or FEEL it! Or disprove what W5DXP is saying.

It appears that current drop is proportional to the current drop in the section
of the antenna that is "missing" - replaced by the coil. You can express it in
electrical degrees and it appears to correspond to cosine distribution.

Yuri, K3BU