There is another issue, namely that the jammers cannot be confined to work in a specific area. The jamming signal will escape the shul and negatively affects neighbors, people walking nearby, cars on the road, first responders in the neighborhood, etc. This is why the FCC has been actively pursuing anyone using these jammers.
PLEASE don’t attempt to do illegal activities to bring kavod to the shul. When [not if], the feds arrest the people involved, the Chillul Hashem will not be worth it. We don’t need more “Hasidic Jews” or “Rabbis” in the news for doing illegal things.