[600MRG] Antenna efficiency question

[Jim Miller]

Is there any "rule of thumb" that would give me a ball park number for the
expected efficiency of my 67x67ft inverted L that I now use on 160 if I
just added a loading coil at the bottom?

If it was (or could be) 10% and the FCC only grants 1w ERP when they give
us an official band then a 10W amp would be all that is needed.

OTOH, if it is likely to be closer to 1% then 100w would be needed.

TIA

73

jim ab3cv