Sony BRAVIA 26 inches HD LCD KLV-26BX350 Television

I didnot buy this from flipkart, as i got a preety good diwali deal from a local showroom. The tv is really good if your room is small. Pro: 1) Sound quality and clarity is amazing (had plans for buying speakers, but dropped the idea...this is more...

As per manual we need to put antenna, I do not understand why they need to put this feature. Still not sure how we need to look for antenna for this purpose.