tcpdump not capturing http or tcp/ssl traffic

I have been trying to learn tcpdump and I am using this command to attempt to monitor my network: sudo tcpdump -I -i en1 But this gives me a bunch of stuff I don't want, so I used this version to filter the packets: sudo tcpdump -I -i en1 port 80 or 443 And it gives me nothing. I know you can't use your WiFi when using monitor mode, but I still can, so I think thats a sign something is wrong. I tried it with en0, but it couldn't go into monitor mode. What am I doing wrong? I am using a MacBook Pro with OS X 10.9.3, and I would like to be able to do this with tcpdump, or any other utility that's built into OS X.