That question about the antenna of LHH was in reply to this :
2331 music on noise level, but I almost never hear them, - it's probably because of their antenna
I have no answer, but surely LHH has chosen to get good results on the UK, from the west of Ireland (as said), so for distances roughly between 500 and 1000 km, not more (not for Gdansk, about 2000 km away).
That subject is poised to be moved to another forum...