There is also cellmapper.com where you lookup where the tower are located & that also shows bands by carrier. While “Jungle” is not what I associate with Germany, publishing maps of cell tower locations is something they may do as alternative to cellmapper.com.
As @mkx says the “beam” is very narrow, so ideally it’s “pointed” at/near a tower. But in terms of software, if the ATL LTE scan isn’t showing anything… I’m not sure much else would (outside some test rig). Keep in mind leaves are very bad for signal, so if you point any direction without dense forest that might change scan results. But where it’s pointed is going to affect the LTE scanner.