You do not want to replace the Trav'ler LNB if you have a Hopper 3. However, it does take a couple of extra steps which I believe were posted here in a separate topic. As I recall you must, at least, keep the Hopper turned off during the search and turn it on once the antenna is locked. I think you also had to add a DPH42 switch to make the Trav'ler work with the Hopper 3.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?