A simple inverted-L (a vertical wire plus a horizontal wire), of no
particular length is about the best you will ever have. The higher the
better. You will need a ground connection such as half-dozen,
shallow-buried radial wires, between 10 and 20 feet long. Include any metal
water pipes with the radials.

An overall wire length between 100 and 150 feet does better on the lower HF
frequencies and on the MF broadcast band. Between 40 and 100 feet does
better on the higher frequency HF bands.
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Reg, G4FGQ

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anyone have a good ideia to build a multiband wire antena?

Carlos Poinho CU3FT