In the USA the old channels 1 to 13 are no more and most folk call those analog. The new channels are capable of transmitting HD but some pump out less than HD for reasons I won't get into.

http://www.lg.com/us/tvs/lg-40LH5000-led-tv does not list the RF as analog but the usual tuner so in short, yes you should pick the new HD channels within the capability of the antenna and tuner.

In parting, when folk get more than one TV and antenna installed they always discover that one set or the other will pick up other channels. This is normal for antenna TV. Folk seem to forget this so I'll add it here.