Regarding the 18' pole, a mojo dove mimics a bird lighting at the moment it is landing to feed, not one flying over the countryside. Having it up 18' in the air is not necessary as long as it's visible from above, which all birds are when in flight. I think folks make the mistake that the higher the mojo is the further it'll pull birds in from a long ways off. I see this alot so please don't take offense.