WESTCables is offering a Dish Pro 21 (DP21) Multi-Dish Switch that allows you to receive signals from two Dish Pro LNBF's and send these signals to a Dish Pro satellite receiver. Use this switch to combine a Dish500 with a Dish300 or combine two Dish300's together. Both LNBF's and all receivers must be Dish Pro Series. You can't combine older Legacy LNBF's with Dish Pro LNBF's. This is a lower cost solution compared to adding the SW34 Switch. ONLY use the DP21 with Dish Pro LNBF's, like Dish Pro Twins and Quads, Dish Pro Receivers and non-Dish Pro receivers equipped with the Dish Pro Adaptor.