No "signal cancellation" occurs at any angle. Except for conductor loss,
every watt of power you feed into it is radiated, regardless of the
angle. What does happen at narrow angles is that the radiation
resistance drops, which can increase loss, although it typically has to
drop quite a bit before the increase is significant. It also narrows the
antenna's bandwidth, so you'd have to retune after a smaller frequency
change.

Roy Lewallen, W7EL

Chuck W. wrote:
I've moved the legs up to about "level" but on the same plane it is in
a "Vee" configuration, close to 90 degrees. It seems to be performing
OK, but I'm concerned that at 90 degrees or less some kind of signal
cancellation can occur. True?

Probably preferable to have them 100 degrees or better angle?

Thanks,

Chuck