As jonwienke points out, it looks like it's just a dual band (144/440) ham antenna. Will it receive down to 500 Khz? Sure it will. But it will be horribly bad
It's only 3.5 feet long.. There's really not enough there for decent reception on HF frequencies. But for the Aircraft band (118 Mhz) and up, it will probably be adequate.
Edit.. I just looked again and see the price is $212 dollars US and the shipping is $58 US (For a grand total of $220.00) . That's nuts.. Do not buy this antenna!
, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag.
my first guess is that it would be in a plastic bag. nothing like quality !