As you note, the other option is to bring your WAP indoors and run a cable from the WAP to the outdoor antenna. RF cable and connector quality and cost varies; the lower the cost, the higher the signal loss. The longer the cable run, the more cumulative signal loss (usually measured in dB per foot). A very long run may require a signal amplifier to compensate for loss. You'd need to price out your exact configuration to compare the cost of a long cable run to the cost of an outdoor enclosure. But you should have no trouble finding example prices by Googling "802.11 RF cable."
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