Originally Posted by N2UJZ
Well I got my antenna & all of the elements are in contact with the metal boom & the driven element isn't isolated. Also with a multimeter across the coax it reads 5 ohms. SoI think what I actually got is either designed by an idiot or just made to look like a yagi.
As has been stated, many yagi's have shorted radiating or driven elements. It's pretty common practice especially when you start dealing with UHF and up. They may show a short with a meter but not to RF.
I have several yagi's from many different manufacturers and most are of the shorted design as can often be seen visually or when checking with a meter. I'd guess a DC shorted design also keeps static buildup to zero.
The one that works the best for me is an Maxrad 12 element that is shorted.
Another one that works very well also is a Maxrad 12 element (older model) but it has a little gamma match tuning stub that is not shorted and shows open with a meter.
I'd say it will work fine for you.
The problem I do have is most of my Yagi's only work well for the range of frequencies they were designed for (850 MHz center in my case). They work for the 700 and 900 bands but they seem to lose their directional properties pretty quick when I get outside the design range. Then they act more like an omni design.
That antenna in your link is rated in dBi so you will probablly see maybe 5 dB of gain.