These 5-in-1 antennas contain five antenna elements. Typically this means one GPS or GNSS antenna element and four additional element. There may be multiples of some of the elements providing MIMO (Multiple-Input-Multiple-Output) coverage on Cellular LTE and/or WiFi. For example, a 5-in-1 antenna might cover 2xLTE, 2xWiFi and GPS.
There are many different combinations possible. The specific combinations are called out at the product level.