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A few years ago, we used to put SMA jacks with bulkhead fittings through the Pelican case and use an external weatherproof antenna outside the case. But the signal loss caused by the extra coax and the bulkhead fitting caused more to lower the overall signal than just using a small antenna inside the Pelican case. So unless we’re connecting a high-gain or directional antenna to a 900mhz radio module for our on-site radio network, I found it unnecessary to put a cell phone antenna outside the case. And as Anthony mentioned above, the antenna orientation and proximity to metal or other large objects has more of an influence on your signal strength than the style of antenna.