If you mount it on the wall, you don't need potential equalization.
General statements are usually wrong, this one too.
Facade antennas that are not installed in areas of the facade designated as safe must be grounded with lightning current-resistant conductors of at least 16 mm² Cu, 25 mm² Cu, or 50 mm² Steel/tinned zinc, just like roof antennas, and connected to the protective potential equalization.
According to the current DIN EN 60728-11 (VDE 0855-1):2011-06, the previously mandatory potential equalization is now left to discretion, provided that the following conditions are met:
Already from a Quatro-LNB onwards, the limit for leakage currents can be exceeded, which is why, without the possibility to measure leakage currents, potential equalization with usually 4 mm² Cu should be implemented even for antenna installations not requiring grounding.
Grounding and potential equalization are integral parts of the electrical system, and NAV § 13 must be observed for installations. However, not every electrician licensed by a network operator is also an antenna professional and competent regarding lightning current-resistant grounding and potential equalization.