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Table 8 — RF Signal Barriers BARRIER SEVERITY Concrete Wall High Metal Wall High Wood Framed Wall Moderate Glass Low Trees Low to High depending on type (high = Pine) People High (mount antenna above pedestrian traffic) Vehicular Traffic High Frequently Asked Questions (FAQs) Q: Can I use an external antenna? A: Yes, many different versions of 2.4 GHz omni-directional or directional antennas can be used. Please contact Carrier for additional information. Q: Can I use other, longer runs of coax t