Wireless is always risky with metal around.What you could do is get a standard PIR & local power supply then wire it to a single channel transmitter with remote antenna. I have often used the Elsema FMT/FMR15101. Runs at 151Mhz @ 100mW & good for about 5km. The transmitter & receiver will only cost slightly more than the Bosch receiver & w/less PIR0
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