From eBay


The SmarTech 27Y5S is an OWA (Optimized Wideband Array) antenna, designed for native 50-ohm impedance.

A peculiar property of OWA systems is the large bandwidth with low VSWR curve. However this does not always imply that antenna radiation properties are same throughout the whole useful band. Thanks to the special modeling and optimization work by SmarTech, the 27Y5S preserves its typical performances up to the band ends.
This antenna has a flat SWR curve covering 27 MHz and don't require the use of antenna tuners.


The quality of materials and the specific sizing of each part, makes the antenna particularly resistant even to important wind loads.

Boom-to-mast plate for Yagi - SmarTech

Mounted in the stack, the 27Y5S allows systems with truly superb performances for as little as only two antennas. The radiation patterns, calculated to the best of the stack configuration, shown by the resulting diagrams of one 2x27Y5S stack vertically. For different configurations and for different needs, you can contact the Technical Division of Smartech.


The main structure is made of aluminum alloy EN AW-6060/82 UNI 9006/1 (Anticorodal 60/100), which provides excellent long-term durability against the most severe weather (ice, water, UV rays, fine particles, acid rain), and better resistance to heavy wind load.

The antenna is supplied with stainless steel parts AISI 304 (Inox Austenitic UNI / EN 10088) and steel S235JR2 (UNI 100 series), certified according to 2000/53 / CE + RoHs standards.

Element Insulators are made of Polypropylene PPC 5660, resistant to remarkable thermic excursions (certified for temperatures from -20°C to +130°C), with high load at break (ultimate tensile strength 25Mpa), excellent abrasion-resistant and volume resistivity > 1018

The antenna is made to obtain the maximum electrical efficiency, the best mechanical resistance and durability, thanks to its high quality materials. It is also suitable for installation in mountain areas and coastal (corrosive) areas.

SmarTech antennas are designed with the minimum necessary electrical/mechanical joints. So, parasitic resistances are the lowest possible so as to minimize unwanted RF dissipations.

In order to maintain its best performances, each antenna is individually checked before shipment.

Costs include proper packaging, completion of customs documentation and shipping tracking 24/7. All products are shipped with the most important and reliable international couriers.

Gain 14.6dBi @12m (39.3ft)
Front/Back Ratio 42.3dB @12m (39.3ft)
Impedance 50 Ohm
Power rating 5 kW
VSWR min. @50 ohm 1.0:1
Matching Method Direct 50 ohm
3 dB Horizontal Beamwidth 60° @12m (39.3ft)
Stacked Distances 6÷9m best 7.5m - (19.6.÷29.25ft)
2 Stacked Gain [7.5m/24,6ft Stacking Distance] 17.2dBi @12m (39.4ft)
2 Stacked F/B [7.5m/24,6ft Stacking Distance] 29.5dB @12m (39.4ft)
Weight 14.8kg (32.60lb)
Boom length 6m (19.7ft)
Longest element 5.5m (18.1ft)
Rotation radius 4.7m - (15.21ft)
Projected area [F=Flat - C=Cylindrical] F = 2.76m² (23.7ft²) - C= 0.43m² (3.9ft²)

5 el. YAGI 27 MHz short boom (27Y5S)

  • € 422.00