Since the antenna on the NRF52DK is oriented horizontally, and the theoretical 3D antenna pattern is a torus (donut) whose hole is pointed in the horizontal axis of the strip antenna, does the NRF52DK have nulls (weak signal strength areas) towards the sides having the pin headers, when the DK is just laid on a table?
So that in most applications, a PCB board having a similar antenna should be mounted oriented vertically in the product, so that the strong signal radiates along the floor, uniform as you walk around it?
Is there an omni-directional antenna, with a spherical (non-toroidal) pattern?