What is the ideal ILS antenna?

Dave ...

That doesn't happen to be true. What you say about the signals is correct
.... Loc/Vor is 108-118 MHz. and glideslope is 325-340. An antenna, to work
well, needs to be an *ODD* quarter wavelength per element. Note that a
1-quarter wave at the Loc/Vor just happens to be a 3-quarter wave at the
glideslope, and as such, will work quite well for both frequencies.

It is traditional to make a "splitter" to take each signal off unaffected by
the other signal. Such a splitter can be made from two cents worth of parts
and a few bucks for connectors and metalwork. You can go one step further
and for half a buck's worth of coax have a two-radio VOR/LOC splitter plus a
glideslope splitter in the same box.

Now, back to the original question. Where is the CURRENT antenna located
and why is it performing so poorly. No bandaids before we do the analysis.

Jim



"Dave S" wrote in message
ink.net...
If he is using the SAME antenna for both glideslope and localizer/VOR its
understandeable how one or BOTH recievers are doing poorly.

Correct me if I'm wrong.. Glideslope receivers are UHF band (400 mhz
range??) while the LOC/VOR is in the VHF band (109-117 mhz range). He did
not explicitly state he had glideslope, using the term "ILS" which im not
sure if he's referring to Loc/GS or Loc alone.

The a/c is a lancair 320 (if the N number search is correct). Where is the
"per plans" antenna location for the nav and GS antennae?