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The Diamond K400S is a trunk or hatchback lip mount for mobile ham and scanner antennas. It clamps onto a hatch or trunk edge with set screws, so no drilling is needed, and its two-axis adjustment lets you angle the antenna for a vertical position. The SO-239 base takes PL-259 coax, and an included SMA-to-UHF adapter covers smaller handheld-style connectors. It handles up to 700W PEP SSB, which is more than most HF mobile setups will ever push, and the rubber pad protects the paint. It suits amateurs and professionals who want a removable, hole-free mount for HF, VHF or UHF whips, though heavy antennas put real stress on a thin lip.
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Lowest price we've seen: $78.95 on Nov 10 at Chatt Radio Online Store. Tracked across 4 stores since Nov 10.
Owners of the K400 series mounts generally report solid clamping and easy no-drill installation, and the adjustable head is a common point of praise. Complaints tend to focus on paint and panel damage from the set screws and on fit on curved or thick lips.