Yesterday on 10m FT8 (4W and the indoor loop)

Yesterday, I went on 10m FT8 with the tiny indoor loop antenna. It was a successful day with my 4W spotted by no less than 67 stations across Europe. On RX I spotted 62 stations.

What is not clear is how far down the loop is on an external antenna like a dipole. At a guess I reckon this must be less than 6dB based on results.

This difference could be important with weak signals, but is probably less important with Es. As mentioned before, I'd like to get an external 10m antenna up soon.

No spots from South America.