Round holes to let your dogs stick their heads out of the box can be a real problem to your tracking collars. Telemetry or Garmin GPS the antennas take a beating. If you zip tie your antenna to the collar you can expect the antenna to snap at that point. We send a rubber sleeve to slide over your antenna to keep it next to your collar and still have enough give to avoid snapping off the antenna as your dog sticks their head out of the holes. We charge $15.00 to replace your telemetry antennas and have tough skin GPS antennas for $12.95, you can easily replace yourself.