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All wireless has the potential of jamming. Two way intruder alarm equipment will have jamming detection so for example on Ricochet after a period of time the device will poll fail which if the alarm was armed would trigger the alarm. Ricochet is mesh but you may get the distance in one hop with it being open air. Alternatively they do external radio passives or use more contacts. With mesh the more devices the better. Proper tinned copper alarm cable would be fine for any normal powered device on a 100m run tho you should have PE stealth if outside, if it's just a reed switch type contact there would be no power anyway.

Does the omit unit buzz when you turn the key? You may need a code for it also/or