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The N4-33 VOR/LOC antenna is designed for high performing aircraft where aerodynamic drag and weight must be held at a minimum. These systems provide increased range and reduced bearing error — not possible with dipole type installations. Rugged metal edges provide erosion resistance and the flush glass housing ensures smooth airflow for reduced drag. Each assembly is foam-filled for maximum reliability. The N4-33 is intended primarily for retrofit installations or antenna modifications on existing aircraft and designed for ease of installation.

The DM N4-4 navigation antenna is a true center-fed antenna which minimizes bearing errors when receiving VOR and ILS signals. The N4-4  provides considerably more gain at the horizon than fuselage mounted ""deer horn"" or ""vee"" antennas. Improved signal to noise ratio and reduced errors is due to the N4-4 greater discrimination against vertically polarized signals, and when properly installed on helicopters greater rotor modulation rejection is also provided. To obtain maximum performance, the installation location must be carefully considered.

The DM N4-7 VOR/LOC navigation antenna is a true center-fed balanced loop antenna with a high sensitivity and low bearing errors. The N4-7 system consists of two center-fed half-loops and a cable which enables a closed loop current flow allowing for improved signal to noise ratio and higher cross-polarized signal rejection. These rugged antennas have proven reliable service on aircraft such as Lockheed Jet-star, P-3A, and C-141 Starlifter, Bell UH1B helicopter, Sikorsky H34 helicopter, Convair 340, Aero Commander, North American Sabreliner, Douglas DC-3, Beech King Air and many other corporate and commercial aircraft.

The N48 series is a balanced loop design assures an omni-directional radiation pattern at the horizon to obtain the maximum signal for standard VOR and area navigation systems installed in lightweight aircraft, medium twins, and helicopters operating up to 250 mph.

The DM NI50 reduces maintenance costs due to its low profile, all-metal blade that provides unequalled mechanical strength and reliability. The NI50 antennas are engineered for use on business, commercial, and military aircraft. NI50 DME antennas can be used will all standard L-Band equipment operating on the 960 MHz to 1,220 MHz frequency band. These antennas are interchangeable with with virtually all L-band blade, flush mountable antennas currently in service on commercial and military aircraft.