UHF and VHF antennas on same mast.
 

1. Is there a preference to which antenna should be on top?
Does it matter?

2. I've searched and found spacing for identical antennas, but I haven't yet
found spacing for UHF and VHF antennas on the same mast.

Thanks in advance,
Charles

1. Not really, although it's standard practice to put the UHF one on top. Basically, put them wherever they work.

2. 3-5' physical separation works fine. Any closer and the antennas start distorting the other's reception patterns which can cause problems in severe circumstances.

2. 3-5' physical separation works fine. Any closer and the antennas start distorting the other's reception patterns which can cause problems in severe circumstances.[/QUOTE]

What would be the problems or severe cirumstances associated with antennas being too close together? How would I know if more or less space was needed between the two antennas?

If you follow guidelines, it won't be an issue. If you don't follow guidelines and it works, fine. If it doesn't work right, you won't know whether that's the reason or not and you'll have to figure it out.