RB wrote:
There are some commonly occurring lengths for multi-band dipoles. I see
105', 135', and 140'. Is 140' preferred over 135'? If so, what is the
benefit of going from 135' to 140'? Just curious.

That's about a 3.5% difference. You get just about that much difference
between insulated and uninsulated wire. That much difference in length
doesn't much matter for non-resonant length dipoles. However, for
resonant dipoles, length certainly matters and 140 ft. would probably
be resonant outside of the 80m band. For instance, a resonant 1/2WL
dipole for 3.8 MHz would be about 123 foot long.
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73, Cecil http://www.qsl.net/w5dxp