What is the approximate maximum range for signals using transequatorial propagation?

Explanation

Because the reinforced ionization on both sides of the geomagnetic equator lets the signal cross without an intervening ground reflection, the reach stretches to roughly 5,000 miles — considerably farther than an ordinary single F-region hop. One thousand miles understates the mechanism, and 7,500 miles is beyond what the geometry of the anomaly can support.