I would never call an omni-directional antenna "dependable". As the expression goes, "An omni-directional antenna receives equally poorly from all directions" because it has zero resistance to that bane of digital reception, multi-path.
That said, an omni is a viable antenna to attempt as long as it is approached with realistic expectations. If it works in your particular situation - "Mazel tov!". If it doesn't, then alternatives will need to explored.
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