No heard by many stations

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G7JGB
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No heard by many stations
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I have been running WSPR as an Antenna test whilst experimenting with a few vertical Antennas for HF based on DX Commanders. When I run WSPR, I pick up stations from 75% of the globe, however, I'm only heard by a handful of stations or less. The other day I was heard by an American station from my home in the UK but no one else. Can anyone suggest why this might be?

To give you some of the technical details, I run low wattage between 200mw and 5w and I always make sure my ALC is zero, I see the power output as it should be. My station works well on other data modes like FT8 and PSK31/63.

Any help on this would be appreciated.

73's
Tony
G7JGB