Your link got corrupted by the full stop which you typed immediately after it. Here it is in a working format:
http://hiigadget.com/tvfox/button-test/
The main content of the ad is basically no different from all of the ads for Freeview which appear on the telly. (i.e. it's simply pointing out that the majority of channels which most people watch via Sky, or whatever, are available even if you don't subscribe to a satellite or cable service). So most of what's there appears to stay within the advertising rules. However this sentence seems not to:
"It is a new "super" antenna that can pick up over-the-air TV signals no other antenna was able to pick up before"
That definitely seems to imply that the antenna can somehow 'magically' bring in other channels which purchasers weren't already receiving.
The problem about complaining to the Advertising Standards Authority is that the website you linked to has hidden details of who owns it. (UK firms aren't allowed to do that but I doubt that there's much, if any, real UK involvement anyway). Further, I can't get details of who it is that orders are actually placed with because the links on that page don't work if the page hasn't been accessed via a Facebook account.
However if this is the page you ordered through
https://www.freeseetv.com/tvfox/order.html
you could try complaining to the ASA about Strong Current Enterprises Ltd, which has a registered address at Dept 706, 19-21 Crawford Street, London, W1H 1PJ. (However that's only a rented mailbox, provided by MailboxesLtd, and as the sole director of the company appears to live in Canada, having moved there from the Philippines, taking any effective action against the company might be tricky).
https://www.asa.org.uk/make-a-complaint.html