In Germany before 1940 for mediumwave transmitters towers of wood were built, in which the antenna was hung up or which carried antenna wires along its structure. A metal tower would block the radio waves to be radiated and so the use of wood as structural element is required. As Gliwice was before 1945 a German town, the radio tower was built in this way, while in Poland already mast radiators or metal towers between which are antenna wires spun were used.
Interestingly, the tower in Gliwice is the only of the German wooden radio towers of the era before World War II, which still exist. More details can be found in the database.
There is no technical requirement to build a cellphone tower as in Kisbér as wooden structure. However it is claimed that it has a better ecological footprint. An other wooden cellphone tower in Germany described on
https://en.wikipedia.org/wiki/Rottenbuch_Radio_Tower will be soon replaced by a lattice tower of steel.