Antonio Vernucci wrote:
My reasoning is as follows: unless my delta loop resonates on one
of the ham bands, its impedance will generally be rather high. So,
using a 4:1 balun would facilitate the tuner task. Any comment on
that too?

If the delta loop's impedance is rather high and the
feedline is an odd multiple of 1/4 wavelengths, what
impedance will the balun see?
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73, Cecil http://www.qsl.net/w5dxp