PATHFINDER products do not support extended antennas of any kind.
Delete the one that is offline from the “Device List” on the app and re-sync it
The smallest neck size the PATHFINDER will fit is a 12 inch circumference neck.
Yes, as long as it is within line-of-sight. If there are hills, trees, foliage, buildings, etc., it will lessen the range.
No. The GPS Connector does not need to be on your body. It can be in your vehicle or placed elsewhere as along as it is within 33 feet of your smartphone for the Bluetooth to work.