I'm looking for an OTA HDTV receiver to receive ATSC broadcasts. I've been looking on Ebay, and I found that it costs quite a bit less to buy a brand new Motorola 550 receiver than an OTA-only HDTV receiver. I am not interested right now to subscribe to Voom right now. Is it possible to use this (or any) Voom receiver for OTA only without a subscription? Will I also be able to receive NTSC channels as well?