The concept of using a directional antenna to eliminate broadcast reception in selected regions is nothing new. This quick test shows that by using a directional antenna to create a cone of reception beneath a sanitizer one could create an RSSI drop off far more dramatic than the drop off due to standard wave propagation seen in an omnidirectional antenna. An additional bonus of the axial mode helical selection is that it’s circular polarization should produce very little variance with change in position relative to the broadcaster. This will need to be verified experimentally.
Note separation of 0.50 and 0.75 meters.
Again, distinct separation between ranges becomes possible with a directional antenna.
