Don't be fooled, it probably does have 2. A great many of these hotspots actually do have 2 external 4G antenna connections, even if you only see one or none! They're on the board of the unit, and are used for testing on a service monitor. The 4620L was a pretty cheaply-made unit, and it actually surprises me that they even put one antenna port on the outside. For example, I use a Sprint hotspot - A Franklin Wireless R850. It features no external antenna ports, but has two of them under some peel-away stickers under the battery door, that can be accessed with an SMK-TS9 connector.