Welcome to the forum!
I'm assuming that you meant the 40.4, but if not, let me know. Sorry, but I don't know if other wifi dongles will work. If they don't, or if you'd rather not mess with it, that receiver comes with an ethernet port on the back panel. So, you can use a wifi adapter like you mentioned, or you can also use an ethernet cable. If you don't have a hardwired connection running to where your receiver is, you can use any wireless access point. We'll be happy to point you towards some if you're aren't familiar with those.