Here's an old thread concerning IR emitter placement for the Dish 301 receiver. Your 351 is supposed to be the same as the 301 except it is used with apartment complexes.
http://archive.tivocommunity.com/tivo-vb/showthread.php?.=.&s=&postid=1410146&.=.#post1410146
I found that link in this thread.
http://www.tivocommunity.com/tivo-vb/showthread.php?s=&threadid=128743
http://archive.tivocommunity.com/tivo-vb/showthread.php?.=.&s=&postid=1410146&.=.#post1410146
I found that link in this thread.
http://www.tivocommunity.com/tivo-vb/showthread.php?s=&threadid=128743