Ben, you've got totally wrong ideas about the technology.
First of all, ALL cell phones, all calls, the whole nine yards in most of the world these days, is data. The GSM and CDMA2000 and other systems convert everything to data, so all calls are data calls all the time. (Except for a few legacy analog systems, and you won't see those in Chicagoland.)
Second, cell phone systems all pretty much are microwave frequencies. Not
VHF. That means if you had a fifty foot cable for a cell phone antenna, it would have so much signal loss that you'd do better by throwing it away. And it would look like irrigation pipe, an inch thick and not very flexible. Very different from VHF radios, where 50-100 feet of cable can have acceptable losses.
Also, in the US, "LTE" is not the same as 4GLTE in the rest of the world. Beware of anything from overseas without a US distributor. In the US, "4G" means 3G with a faster backbone connection, and "LTE" is an entirely different
service. We don't really have 4G-LTE here. 5G is not expected to deploy until 2020 now, so that's not an issue. "LTE" is pretty much the same no matter which carrier you have--but some carriers in some places use different frequencies (bands) so check that the
equipment will match the carrier.
So what you need is a "whole house" cell phone booster. Try Wilsonamplifiers.com (now called "weboost".) You will need to install a cellular antenna AND the booster box both up the mast, and then the booster acts as a miniature cell site. Your phone connects to the booster instead of the real cell tower, and the booster relays calls, the same way another tower would.
You're probably looking at $400-500, sometimes carrier-specific.
It used to be possible to literally just
plug a better antenna into most cell phones. But you can thank your carrier for cutting that out. Like user-changeable
batteries, they just don't see the need to bother the customers with anything that might be, you know, technical. Or not small and shinier.