Producing a decent signal in the race on the lower bands is a matter of the output stage and the antenna. A forty-meter vertical will produce a signal that few people have, perhaps only those fanatics who invest hundreds of thousands in masts.
The idea of using balloons to pull out a vertical antenna is not new. It can be used for one-time events such as CQ WW contest za predpokladu že bude bezvetrie alebo len slabý vietor.
This idea was dusted off thanks to the fact that you can also buy the necessary helium and balloons here. We can choose either a larger number of smaller balloons (10-15) and a small helium bomb or a large advertising balloon. The company that bought it for advertising purposes could also lend you these.
Considering that it is a temporary antenna, an antenna seems to be the most suitable lambda/2, which saves us the effort of burying the radials. This antenna has a high impedance in the tail, so a transmatch will be required to connect to the coax cable. Bandwidth for PSV<2 is about 80kHz in the 80m band.
The radiator is about 40m high, we can do precise tuning using GDO. Due to the fact that the antenna will never be completely stable, the PSV will also change. It is advisable to set the antenna to a lower frequency, because the wind will push it down, thereby shortening it. It is only possible to build such a high antenna at a sufficient distance from trees, HV masts and other dwellings.
V prípade, že sa bude meteorologická situácia zhoršovať (búrka, vietor), anténu stiahneme. Drôtový žiarič sa veľmi dobre zvíja na bubon záhradnej hadice, v núdzi aj vedro. Zvinutím na lakeť či dosku by sme deformovali medený vodič a pravdepodobne by nám vzniklo neforemné klbko.
Literature:
[1] Two contributions to antenna issues, RZ 9/1985
[2] http://www.hard-core-dx.com/nordicdx/antenna/special/baloon.html