I do not know anything about medicine.
But I am electrical engineer. You will be exposed to an electric field, this is normal. But the transceiver antenna in not at a normal power level. So consider yourself as risky as a electrical worker is, you are at higher risk so you should take precautions. The electric field will move electrons through a conductors like metal, water with a electrolyte dissolved in it, or acid. You are water with a electrolytes and acids, the electrons will move in you. As they move from one atom to the next, the atom does not care which electron it has, it just cares how many it has, one electron is as good as the next for chemistry to work. So when the electrons move they don’t move freely, they push against resistance, and so cause heat. Like any heat source, if you feel hot, then move away, moving away works. You will not be shocked by the field, don’t play with the antenna cables or wave guides.
If your building board wants a transceiver antenna for the money, then let them spend some money to shield below the antenna, and insulate below the antenna. Shielding is simply a sheet of metal, aluminum is nice, but ground that metal with a ground wire will make it much better. The ground wire is the third wire that almost no-one has in their home. Shielding over your apartment would protect you and the apartments below also, so it affects more people than just you in a good way. No-one has added the ground wire because if they don’t route it outside their walls, and can’t snake it through their wall then they have to tear up their walls. For you Jules, add the ground wire to your building. It must go from the roof shielding, all the way down to the ground.
You can check if you have one, turn off the switch/breaker/fuse for an outlet with three prongs, unscrew and pull the outlet out and see if you have three wires, or just two, the third would probably be a bare copper wire (the green screw) and probably isn’t there. The ground wire is not the neutral wire (the aluminum, silver color screw), they are different. A wire from the roof, going to your apartment and all apartments below would benefit each of them by protecting your electronics, and protecting the people from potential ESD and shock harms. If you don’t want to tear open walls, then it can be added separately from the other wires, but then it would be hard to ground the apartment outlets with it. As a shortcut people want to tie the ground wire to a water pipe so that they don’t have to route it all the way to ground. When this is done wrong by using dissimilar metals they will react like a battery, corrode, loose electrical contact, and defeat the purpose of having the ground wire, with no obvious warning, only inspections will discover the problem. Make sure that an electrician (journyman, journywoman) brings the wiring up to code.
FCC (Federal Communication Commission) regulates interference by allotting bandwidths to this or that purpose. The transceiver antenna is made for a different frequency than your other devices, your cell phone should get fabulous signal strength. But Chris is right, there are harmonics (side-bands), and they will be strong in your apartment (and the grounded shielding will severely weaken them), so keep an eye on interference with your Wi-Fi, Bluetooth, cordless phone, and cathode ray tube (older TVs), and other electronics. Report the interference to the building board, the cellular company, and the FCC if the problem persists.
Tell your building board to put a wind turbine or some solar panels on the roof instead, solar panels are heavy but they are so quiet. I don’t recommend an industrial transceiver antenna on your roof, it sounds like all greed and no sense to me, a bad combination.