This is not only for HP(see it in Acer, Lenovo... ). They leave the one ANT connector disconnected on cheap laptops because there is no antenna for it.

Drivers will default to a mixed mode where both antennas work(one receiving one transmitting), now if you install drivers on Windows from official driver package it will work as intended because install will configure drivers to only user ANT1. And you can do it manually if you chose not to install drivers, "the official" way.

I'm not making an apology for mentioned companies just clarifying that this is known thing for cheap laptops.