"Wes Stewart" wrote

The line length *is* a factor, however, they give a simplified
approximation for the case of a length more than 20 times the line
spacing and the line spacing less than 1/10 lambda.

P/I^2 = 160 * ( pi * D / lambda)^2

whe

P is in watts

I is the RMS current in a matched line

D / lambda is the wire spacing in wavelengths

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I don't see line length in the formula.

What do they say about line lengths less than 20 times wire spacing
for small spacings?
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Reg.