Overview

InnovAntennas High HF Band Optimized Log Periodic Arrays

InnovAntennas High HF Band Optimized Log Periodic Arrays (BOLPA) are unique directional antennas that cover the high HF bands. Rather than sizing and distributing all elements to provide uniform performance everywhere, the BOLPA has been optimized to provide the highest performance within the Amateur Radio bands, resulting in exceptional performance across the entire covered bands. With a direct 50-ohm feed point, the overall front-to-back ratio and antenna gain is significantly improved compared to conventional 200-ohm LPDAs. Designer Justin Johnson, G0KSC, describes the BOLPA design in more detail in the "ARRL Antenna Book."

If you want a high HF beam antenna that lasts and performs in all weather conditions, without SWR or bandwidth shifting, order one of the BOLPA listed here!

BOLPA-4
The BOLPA-4 is brand new and offers the advantages of the BOLPA for those who have less space. The BOLPA-4 has a twin-boom length of 18 ft. (5.5 m) made of 1.25 in. square tubing, with only 4 elements, but fully covers the 15 meter band and the 24.8 – 30 MHz range, including the 12, 11 and 10 meters bands. Like all BOLPAs, the BOLPA-4 has a direct feed point impedance of 50 ohms and is a super heavy duty antenna that will survive wind speeds in excess of 100 mph (160km/h). SWR Sweep is 1.5:1 or under for the entire 9 MHz frequency range - No antenna tuner or matching is needed!

BOLPA-3

The BOLPA-3 is manufactured on a much smaller boom and is therefore the logical choice for lightweight masts. The BOLPA-3 has an 11.5 ft. (3.5 m) twin-boom made of square 1.0 in, tubing and covers 24.8 MHz to 30 MHz without gaps, including the 12, 11 and 10 meters bands. So it is an excellent choice for those who want something for the upper HF bands for the current solar peak. SWR Sweep is well below 1.5:1 for the entire 6 MHz frequency range - No tuner or matching is needed!


BOLPA-2

The BOLPA-2 is a very compact version of this antenna type with only a 7.9 ft. (2.4 m) boom and 2 elements. The BOLPA-2 covers the 11m and 10m band. Even on 12m the antenna can still be operated with a tuner and still has around 4.5 dBi on this band. If the space on the mast is limited, but 10m is a must, the BOLPA-2 is the right choice. SWR Sweep is 1.5:1 or under for the entire frequency range - No tuner or matching is needed!

Documentation

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