Can this be used as client? Jeff? Anyone?

Yes, I was thinking of the same thing. One way would be to buy the version of the Yagi with the folded dipole driven element, but that's too easy. It might be possible to build a folded dipole using flat copper wire exactly like the MFJ-1800 driven element.

There's a catch. The resultant antenna ended up with a 200 ohm drive impedance, instead of 50 ohms. However, a 2:1 balun is easy enough to build. I usually use semi-rigid coax cable for the balun. See balun details at:

One potentially expensive problem is that you're going to need some test equipment to determine if it's correctly tuned and positioned. Besides the usual "tune for maximum" gain adjustments, there's also minimizing the VSWR.

I use a reflection coefficient bridge, RF sweep generator, and oscilloscope.

When you start delving into this subject is show how much there is to it.

Plenty to learn.

And some pretty smart people out there.

Interesting links.

Cheers

Rob