David wrote:
The design was assuming that the elements were to be insulated from the
boom but I am having trouble making small insulators to hold these in
place.
It would be simpler for construction if I could simply drill through the
beam and weld the rods in place or connect via a screw through the
centre of the beam.

The correction factor formula I have found seems to be for insulated
through-beam elements.

Q: Is there a correction factor I can apply to enable me to construct
the antenna in this manner ?

The ARRL Antenna Book has a graph showing the correction needed for
thru-the-beam elements. I can't recall if it is for insulated elements or
not. It's in the chapter on Yagis -- the chapter with all the K1FO yagi
designs.

Q: Is there an alternate design I could use that would be simpler to
construct. (I am looking for around 7dB gain at low angle of radiation -
point to point communications link). Feedline is 50 Ohm coaxial cable,
power is less than 1 Watt.


WA5VJB has some cheap yagi designs, and also sells PC board-based antennas on
his web site.

http://www.clarc.org/Articles/uhf.htm

I built a 902mhz WA5VJB design using a piece of square moulding. If you paint
the boom with primer or polyurethene, it should last some time.

Glen, kc0iyt