On COD 4 I can't conect to the host some times,should I buy a wireless network adapter ?

At the moment I use an ethernet cadle,if I buy a wireless network adapter will it let me connect to the host.Or is it better to use an ethernet cable because someone said phone signal interupter them.I can't connect to my some of my mates,so I ask another mate to creat a party and invite us.It's really annoying.ANYONE HElP!!!

its not the adapter of ethernet, it's your connection and your NAT hearing this your NAT is not open to find this go network setting and check your network and see what your nat is what you might need is either a new internet provider or a new router

check this link out even though its for ps3 it still applies the same for xbox

http://www.ps3forums.com/showthread.php?t=74303

A wired connection such as you have now, is far less complicated than a wireless connection.

Who is the host?

Check your firewall settings - or your friends should check theirs.

A wireless/wired connection has nothing to do with this problem. Its either to do with game settings, modem or network settings, or firewall settings