Zero-vector (scalar) EM systems are the key to scalar
EM waves, which are actually electrogravitational waves.
Scalar wave detectors nave been developed and are being improved. Further improvement is needed. This development is limited only by funds.
The initial theory has been begun. More work is needed. Again, this development is limited only by funds.
Preliminary experiments support the scalar EM concepts.
Equipment can be designed and made to work electro-gravitationally.
And it has been.