Don't confuse resolution and bandwidth. I have seen an entire OTA broadcast channel used for a single SD feed and have also seen the same amount of bandwidth carved up into two HD resolution feeds. Most channel have moved to HD distribution, even channels that are not carried in HD can be received in HD and converted. Passing through the HD depends on contracts and available bandwidth (since a HD channel should consume more space on a satellite or cable feed than a SD channel). Reception in HD does not guarantee distribution in HD.