Total posts : 45366
As a ham, you shoud know a tuned system is critical with flea power, and, yes, the receiving system makes a big difference.
710 khz will not get very far even with a tuned antenna for a couple reasons. The idea is to load a legal antenna as efficiently as poossible, therefore, with such a short antenna, a loading coil will be more efficient with less wire/turns. The higher the frequency the shorter the wavelength. At 710 khz, the loading coil would have to have so much wire it would lose too much to be efficient.
Also, lower frequencies are more effectient in the near field (one of the reasons for using them with CC installations), but drop off quickly after that, according to the spec frequency. I can’t run numbers here at the moment, but loading coils work best above 1500 khz.