A bit later, I made a kit of the antenna
suitable for my mountain trip. Testing of the antenna in the mountains
shows, that my YAGI is compared to collinear in 3- 5 meters long
on distance up to 50 kms and beats the antennas up to 90 kms and
Photos below shows kit of my trip YAGI.
Only 30 seconds are needed to install the antenna. Boom for the
YAGI was made from a plastic water pipe in 510- millimeters length
and 21- millimeters in diameters. Transformer 12.5-Ohms/50-Ohms
is placed inside the plastic tube. The
antenna is good fit to rucksack and may be easy repaired in the
For those who do not want cut length oh
matching transformer was calculated antenna having 50- Ohms input
impedance. So coaxial cable may be directly to
connected to antenna terminals. View of the antenna is almost
the same, however, simple RF-Choke near antenna terminal (0ne-
three turns around a ferrite ring is recommended for the design.
Distance between reflector and director should be chosen (415-
440 –millimeters) for minimum SWR. The antenna has gain near 4,3 dbd.