Marconi got most of the credit, for his wireless-telegraph experiments, but Nikola Tesla invented radio as we know it today; a court ultimately made that determination, on behalf of his estate. (Tesla died broke.)

A conductor that is directly connected to the earth is called ground. One of its applications is through the determination of the field strength of surface wave radio transmissions.

The verb from 'determination' is 'determine'.

the kid had determination

The verb for determination is "determine".