"billkennedy3" wrote:
So, my questions

Is a "V" array a good idea for directional gain? What angle?

Should the top of the "V" be oriented forward to maximize
reception
from that direction?

How long should the elements be for optimum reception of a 109MHz
signal?

Jim can advise on the specifics if he desires, but to avoid
potential contradiction, I'll say only there's more than enough
signal strength available from the ILS antenna for practical IFR
use. So, the effect of optimizations you propose will not give you
anything you'll ever notice. I imagine for something as
safety-critical as an ILS, FAA gotta send you enough RF energy to
allow for things not being quite up to snuff on your end, or
seriously still shooting a LOC approach with a ratty old Genave
Alpha 200...

But what's your theory on why your present antenna sucks for both
VOR/ILS? Might it be the receiver, or coax? Did you install a
balun, or if self-fabricated with RG-58, are the dimensions
correct? Are the tips located near to any lengthy run of metal?
Optimizing a replacement antenna won't make up for the problems
these items can cause.

Fred F.