If using only for reversing they are OK, but if you are wanting to use as rear vision whilst towing useless. The cameras are way to wide an angle to be practical as a rear vision display. They also suffer from interference from the likes electric fences and leaky power lines.
I have a 2.4 Ghz wireless camera on the back of my caravan with a 7 inch colour monitor/receiver attached over my rear view mirror. It is used solely to spot traffic approaching from behind. Whilst the camera has a wide view lens it is not useless. Traffic approaching from behind are clearly discernible when within 200m. In over 7000km of travel I have never experienced any loss of signal or interference. I have travelled the length of the South Island of NZ and have never experienced interference from farmer's electric fences. The system I have uses frequency hopping, similar to that used by model aircraft R/C systems. It was not a cheap purchase, but obviously it pays to buy quality.
Hi there We run a digital wireless camera as a rear view camera. Ours will lose picture for a few seconds if you are passing a telecom tower but cones back within a few seconds. The good ones arent cheap but you must use a digital system, we also run a 7" screen and can see cars a long wat back very happy with its performance.
Most of the criticism I see is analogue rear view systems. Hope this helps
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For a rear view equivalent to an internal mirror you need approximately a 30 degree view camera. These are very expensive if you can get one. We have a 45 degree camera which gives slightly smaller display also on a 7 inch (why imperial I don't know) display. With the usual 120 plus degrees of reversing cameras you don't discern closing vehicles from behind until they are virtually up your clacker.
Thanks everybody for your replys very nice to hear. how these operate. I pick up my new poptop in 2 weeks and looking forward to fit one of these. you people have been a great help. thanks again. TERRY.
I ran a 2.4 ghz one from Jaycar on the back of my ute. Was useless - picked up way to much interference from my phone. Even with my phone on flight mode it showed frequent static and dropouts. I returned it after 2 weeks.