5G wifi capability

As BobTheFisherman suggests, Every computer with the MacBook Pro nameplate (all post 2006) features both 2.4GHz band and 5GHz band Wi-Fi operation.

Three antennas have been available since about the 2011 models.

https://en.wikipedia.org/wiki/5G

5G is a cellular communication technology. The Mac is not a cellular device.

Maybe you mean GHz rather than 5G (Fifth Generation).

From: https://en.wikipedia.org/wiki/Wi-Fi