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No unfortunately you can not do this, as the satellite at 121 is a much lower powered satellite and needs a bigger dish (as well as a regular KU LNB) to pick it up.
You will need to upgrade to SuperDISH to get those locals, but the good news is Dish will replace all your stuff such as switches, and Dish free of charge for you when you upgrade.
Just be aware that some older equipment such as an origional Dishplayer, a Dish 1000, 2000, 5000 and a few other receivers are not SuperDish compatable.
Again welcome to SatelliteGuys!