Embodiments herein relate to the detection and switchable use of a detachable GNSS antenna with a wearable electronic device. In various embodiments, a wearable electronic apparatus may include a multi-band antenna to receive satellite positioning signals in a first frequency band and local radio frequency communication signals in a second frequency band, an antenna connector to optionally receive a detachable satellite positioning antenna, and a switch having a switching terminal, a first input terminal coupled with the multi-band antenna, a second input terminal coupled with the antenna connector, and an output terminal, wherein the switch is to selectively connect the first input terminal or the second input terminal to the output terminal, in response to a state of a switching signal received at the switching terminal. Other embodiments may be described and/or claimed.