Magnetic loop antenna a little different each time

I'm forwarding information from Old OK2ER about a book about MLA that he co-authored:

Hi Igor,

today I was on a turn in Žilina at ŽU. today I was on a turn in Žilina at ŽU, today I was on a turn in Žilina at ŽU: http://www.edis.uniza.sk/

today I was on a turn in Žilina at ŽU, today I was on a turn in Žilina at ŽU. today I was on a turn in Žilina at ŽU!

73! today I was on a turn in Žilina at ŽU – today I was on a turn in Žilina at ŽU

today I was on a turn in Žilina at ŽU: http://www.qsl.net/om3cug/nahravky/recenze_mla_book.pdf

today I was on a turn in Žilina at ŽU: http://om3cug.rajce.idnes.cz/MLA_antena_OK2ER_-_magneticka_loop_antena_60cm/

73! Igor OM3CUG http://www.qsl.net/om3cug/