Bill Turner wrote:

SNIP

And finally, don't be persuaded by that old saying about how a two
element quad is equal to a three element yagi. So what? A three
element yagi is FAR easier to build than a two element quad.

The bottom line is this: Once the quad is up in the air, it will
generally outperform a yagi of equivalent cost. The problems lie in
getting it up in the air and keeping it there.

If I had it all to do over again, starting from scratch, I probably
would use a yagi.

--
73, Bill W6WRT
QSLs via LoTW

And, I would use a Log Periodic!! I give up about 1 dB in gain and
acquire a 13.5 MHz to 33 MHz broadband antenna, no traps, full legal
power handling capability and a VSWR 2:1 across the full range. That
means 20, 17, 15, 12 and 10 meters all in ONE Beam.

W1MCE

It depends on what one wishes to accomplish and how long one expects the
antenna to endure.
It is assumed that the antenna is designed to survive the pressure
due to the expected peak wind velocity (at the height where it is
mounted) and expected radial ice loading. [See EIA 222F or G]
For near maximum performance on a single band (or set of single
bands) with a tower that is at least one wavelength high, a yagi with at
least three elements is hard to beat - especially if one mounts
additional antennas on the same rotating mast.

For about 1 to 2 db less than what can be achieved with a (single
band) yagi, and perhaps that much more than many triband beams, - on a
tower that is at least one wavelength high at the lowest frequency - one
may cover all of the HF bands from 14 MHz up with one LPDA (log
periodic). In my opinion, on the higher HF bands, most radio amateurs
will be best served with a LPDA in view of the span of frequencies now
available and the lack of a need to tweak well designed examples of such
antennas.
73 Mac N8TT

--
J. Mc Laughlin - Michigan USA

"Dave Shrader" wrote in
snip

And, I would use a Log Periodic!! I give up about 1 dB in gain and
acquire a 13.5 MHz to 33 MHz broadband antenna, no traps, full legal
power handling capability and a VSWR 2:1 across the full range. That
means 20, 17, 15, 12 and 10 meters all in ONE Beam.

W1MCE