Absolutely fascinating, Robert. Wielkie dzięki! Athough I have less comprehension of spoken Polish than a two-year-old child would have, I was able to follow most of the discussion about the amplifier modules. A very elegant design, utilizing some impressive toroids.
However, I understood very little of the guide's explanation of the antenna. Perhaps you could clarify some points for us?
The text of the article calls the directional pattern a "figure-8," as does another Web page that I saw previously, but the shape on the coverage map would be more accurately called a modified cardioid. One would expect a cardioid pattern from an array of two elements spaced a quarter wavelength apart, with close to a 90° phase lag in the forward-facing element (the one in the direction of the main lobe of the pattern; in this case, the southeastern tower). The fact that the rear lobe is not fully suppressed...and in fact, there are no nulls at all in the pattern...indicates that the currents in the two elements are not equal.
This condition could be achieved by two different approaches.
1. Both towers could be actively driven with RF power from the transmitter, each through their own open-wire transmission line, with the desired current ratios and phase relationships determined in a phasing network. Or,
2. Only one tower receives RF directly from the transmitter and the other acts as a passive ("parasitic") element. This idea is supported by the 14% difference in heights of the two masts. Either the taller mast is the driven element (radiator), while the shorter is a passive director; or else the shorter one is driven while the taller one serves as a passive reflector.
My guess would be that the second approach is the one used at Solec Kujawski, and that the northwest mast is the taller of the two in the array. Taking end effects into account, I might go even farther out on a limb and speculate that the the southeasterly tower may be the one being driven by the transmitter, while the northwesterly one acts as a passive reflector.
Was the guide in the YouTube video saying anything that would either verify, modify, or contradict my guesses?
That is a magnificent transmitter installation, and the antenna system is set in a most beautiful location! I hope the station remains in service for many years to come.