On Sun, 9 Aug 2009 21:24:01 -0700 (PDT), Art Unwin
wrote:

The majority of antennas used today are (commercial) circularly
polarized
Ham antennas remain in the linear domain (ala the Yagi and similar)
There are many reasons espoused in CP advantages in "point to point"
What is the main advantage hams hold over the more popular circular
polarized antennas in its "skip" type useage versus "point to point" ?

Huh? By "skip", I presume you mean for HF and DX. Numbers are always
nice.

There are CP antennas for HF:
http://www.bruhns.us/CP_on_HF/CP_on_HF.html
www.roke.co.uk/resources/datasheets/locate-sarsen.pdf
www.ascsignal.com/images/content/gov_radar/pdfs/TA103.pdf
http://www.antennaproducts.com/ht30detail.html
The main advantage is that they deal with multipath better and don't
have a deep cross polarization null. I've never tried one so I have
no idea how well (or badly) they work.

For what it's worth, we did some experimentation with CP on 146MHz
repeaters in the 1970's. The results were an impressive reduction in
"picket fence" type of fading for mobiles. However, the anenna gain
was less than an equivalent size linear array, so there was some range
reduction.

Mo
http://www.qsl.net/n/n9zia//cir_pol_rpt.html

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558