The feasibility of detection of electromagnetic response in the upper ionosphere to ground large-scale ultra-low-frequency (ULF) and extremely-low-frequency (ELF) transmitters by low-Earth orbit (LEO) satellites is considered. As an example of such transmitters, we consider the ZEVS 82 Hz transmitter for submarine communication, FENICS experiments with decommissioned electric power lines driven by 0.5-150 Hz generator, and industrial 50 Hz power transmission lines. We numerically model the ULF/ELF wave energy leakage into the upper ionosphere from an oscillating grounded linear current of a finite length suspended above a high-resistive ground. A realistic altitudinal profile of the plasma parameters has been reconstructed with the use of the IRI ionospheric model.