Trapped Dipole Antenna

The Hilomast Trapped-Wire Dipole Antenna is a compact and simply-operated multi-frequency antenna, designed to provide up to 6 spot frequencies (dependent upon channel spacing) with bi- or omnidirectional coverage in the HF band. The antenna may be used as shown, with two support units (preferred method) or more economically using a single support structure.

The construction reflects Hilomast, LLC’s policy of ensuring long trouble-free use, utilizing only the best quality components. Each antenna is supplied complete with 30m of low loss coaxial feeder incorporating a strain-relief arrangement, and fitted with one PL259 UHF connector.

The Dipole Center Junction is formed by a balun unit to ensure matching is achieved.

The elements are constructed of hard-drawn copper magnesium multi-strand for durability and high resistance to corrosion.

Please feel free to contact Hilomast from our “Contact” page of this website, or call Hilomast, (386) 221-5006, and we will be glad to discuss details and/or options relating to your specific needs or on other competitive products in which we specialize.

Technical Specification

Spec	Data
Frequency Range	2-30 MHz 2 to 6 spot frequencies (depends on frequency spacing).
VSWR	Normally better than 1.5 : 1
Polarisation	Horizontal
Power Rating	Normally up to 250w (up to lkw).
Azimuth Radiation	Depends on frequency and height of antenna.
Input Impedance	50 ohm

Hilomast LLC reserves the right to change specifications without prior notice.

Mechancial Specification

Spec	Data
Antenna elements	7/0.914mm (7/036") or 7/1.118mm (7/044") hard drawn copper strand
Insulators	Carbon loaded ultra violet resistant polypropelene
Coaxial cable	Centre balun unit with built-in halyard eye and cable suspension unit.
Junction	Encapsulated in high grade epoxy resin
Metalwork	Stainless steel or plated brass
Coaxial cable	Normally 30m UR67 low loss

SMC reserves the right to change specifications without prior notice.

Accessories

The most important components of this antenna are the Traps. These are installed in the antenna elements, and provide the means by which multi frequency operation is achieved. The Trap components are fully encapsulated in epoxy resin, providing a non-hygrascopic and very strong unit, with proven durability.

Antenna installation kits are available incorporating such items as element end “T” anchors, extension halyards for use in the central support mode.

Although this antenna is offered as a standard product, variations of construction, coaxial cable, connector combinations, or various insulation combinations for hostile environments may be accommodated.

We generally recommend the use of our PA Series lightweight mast to support the Trapped Dipole Antennas. This provides a compact support structure, of ultra light weight, supplied complete with transport holdall and erection tools.