WIFI and commercial oven

Hello

I am looking for a WIFI antenna (for VoIP) that can withstand continuous heat up to 400 degrees F (205 degrees C). It will be placed in a commercial oven, a place where we work and where our old analog phone worked. Do you know a model or an alternative? The oven is insulated steel with 6 inch walls ...

Thank you!

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EDIT: Anything that can be wired to the outside of the oven suits me, but I do not know the right component! So I called it a WIFI antenna, it may be another therm that I should have used ...