ELEVATED FLAG MODEL FOR 80m
Full size flag modeled for 3.5 Mhz.

The top model shows how a flag at 100' although a good rx antenna for 160m, would not perform well on 80m. A nasty high angle lobe develops above 1/4 wavelength. 

The optimum height for 80m appears to be around 61 ' see the second model below.

80M FLAG AT 100' (30M)
80M FLAG AT 61' (19M)

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