I have a hurricane one 16 inch fan mounted to a wall in the grow room that is 7 years old, I bought 2 more in the last 3 years and they are usually dead in a year, the oscillator is usually the first to go.  I think Hurricane was bought out or started making them over seas a few years ago and they are not what they used to be so get the extended warranty if you buy one.

I think I saw add on poles for tents on Amazon but I cant remember. A 1 X 4 and zip ties will work or you can make something more complicated if you want. Pipe hanger clamps usually fit the  tent poles, from there its tinker toy time