A cantilever umbrella has a canopy attached ... so you must buy something to hold and stabilize the pole. Patio umbrella bases are fairly universal, so you don't have to choose the same brand ...
The Family Handyman on MSN4mon
11 Ways to Create Shade for the Deck or Patio
Consider a cantilever/offset umbrella. Its base sits to the side ... tends to provide more shade than a patio table umbrella.