The short answer
A wireless fence's transmitter broadcasts a circle, and metal blocks and reflects that signal. PetSafe advises keeping its transmitter at least 3 ft from metal and notes metal roofs and RVs can shrink the boundary. Place the transmitter centrally, high, away from appliances and metal siding.
What interferes
- Metal roofs and siding.
- Large appliances such as refrigerators.
- Vehicles and RVs.
- Thick masonry walls.
Placement tips
- Keep the transmitter at least 3 ft from metal (PetSafe).
- Place it near the center of the area you want.
- Raise it off the floor.
- Walk the boundary with the collar after any move.
Systems we cover
PetSafe Wireless Containment covers a circle up to 180 ft across; Stay & Play Compact up to 3/4 acre.
SafetyNo electronic fence is a physical barrier. Never rely on one alone near a busy road.
Products mentioned
Questions readers ask
Can I use a wireless fence in an RV?
Metal RVs can shrink the boundary a lot; check before relying on it.
Why does the boundary move?
Interference and signal reflections change the circle's edge.