It's a 1/4 wave antenna with a groundplane. Physics dictates the size.
Compared to the PCB antenna in your average USB dongle, this would have at least two to three times the range, and likely more than that, because you can put it somewhere more optimal than just poking out the back of your device.
I just got GPU temp monitoring working on my old dell laptop. "Heat management" for the GPU is pretty much just an extra chunk of steel tacked onto the heat pipe halfway between the CPU and its radiator, so GPU temps are always in the red.
I might as well just turn off monitoring and remain ignorant π€·