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We propose an antenna designed to generate monochromatic electromagneticknots and other "unusual electromagnetic disturbances" in the microwave domain.Our antenna is a spherical array of radiating dipolar elements configured toapproximate the desired electromagnetic field near its centre. We shownumerically that a specific embodiment of the antenna with a radius of 61.2 cmand only 20 element pairs driven at a frequency of 2.45 GHz can yield linkedand torus-knotted electric and magnetic field lines approximating those of an"electromagnetic tangle": a monochromatic electromagnetic knot closely relatedto the well-known Ra\~nada-Hopf type electromagnetic knots but simpler in itsconstruction. The antenna could be used to locally excite plasmas.

Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot