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Dropping wire is the absolute best way to go, however:

A properly thought-out wireless system is the second-best way.

This might consist of P2P links, multiple access points, etc. over the subject property.

That's not to say this is expensive, check out Ubiquiti and Ruckus products for examples of the kinds of radios you need to make this happen. All should fairly affordable in comparison to renting a trenching tool and dropping cable.