This is the LNB you will need for the 300 dish pointed at 61.5 west,
to facilitate using the Sw34 switch to enable you tolook at 3 satellites with up to 3 receivers. It is only designed to be used with the newer receiver model numbers 301, 311,322,501, 508,510,522,721,811,921. If you need a single lnb for an older model receiver not listed above you will need the Legacy dual Lnb because the singles are no longer available.