Jeff Liebermann writes:

services and vendors are on the tower, building, pole, whatever. A
tower ID to lat-long database will certainly be useful, but the real
problem is what frequency to use. For example, for LTE:
https://en.wikipedia.org/wiki/List_of_LTE_networks
the bands in use world wide are many and varied. Same with TDM vs
FDM, full duplex vs half duplex, odd splits. Then, there are
sub-bands for each vendor. Notice the number of question marks in
above tables.

You could use GPS coordinates or just scan all the frequencies:
https://en.wikipedia.org/wiki/LTE_frequency_bands

LTE is a pain, we're just moving from a global 3G/UMTS product to LTE.
This means a different antenna design, LTE module version and whatever
for each region and even operator specific ones :-(

--
mikko