The WS2812 series of LEDs with built-in controllers may be a very simple solution for your application. They are most often seen on the LED strips / rolls and in that format come with a controller.
Each LED is connected to positive and negative supply and a data line is fed in one side of each chip and out the other to the next chip. A string of pulses is ...
Therefore I will select an antenna to only support one or two of the bands. I can select the band in my modem through software using the command AT+CBAND.
Sadly, you're not in charge of selecting the band – your network operator is. So, all your considerations are in vain: you'll have to use what they are willing to offer you.