There are a number of designs available, and any yagi design for 20m to 10m can be rescaled to 17m with
good results (as long as you adjust for the difference in element diameters, etc.) The mechanical aspects
of mounting the elements are no different than for the other bands, either. So if you find a 20m or 15m
design that meets your needs for gain, F/B, and number of elements, it is an easy matter to build it for 17m.
(Remember to scale the element diameter along with the lengths.)
Here are some resources that you may find interesting and/or useful:http://www.cebik.com/content/fdim/fdim11.pdfhttp://www.cebik.com/content/a10/yagi/3lyg.htmlhttp://www.cebik.com/content/a10/vhf/scales.htmlhttp://www.cebik.com/content/a10/yagi/eq-yag-1.htmlhttp://www.cebik.com/content/a10/yagi/5l20.htmlhttp://www.ifwtech.co.uk/g3sek/diy-yagi/index.htm
(scroll down to "Element and Boom Corrections")http://www.mydarc.de/dk7zb/3-Ele-Kurzwelle/17m-28Ohm.htmhttp://www.mydarc.de/dk7zb/3-Ele-Kurzwelle/4-17m-28ohm.htmhttp://www.mydarc.de/dk7zb/2-Ele-Kurzwelle/2-Ele-17m-Dir28.htmhttp://www.g0ksc.co.uk/http://www.arrl.org/files/file/protected/Group/Members/Technology/tis/info/pdf/0008057.pdf
Meanwhile, W2PV developed an interesting 4-element yagi with rather narrow bandwidth and irregular
element spacing that is ideally suited for the narrower WARC bands called the "PV4". My 1988 ARRL
Antenna Book has design information and a 12m example summarized from a 1986 article in QST.
So if you decide how many elements you want on what length of boom (based on designs for other
bands) it can be converted to 17m fairly easily.