Yes it is Ok to have the coax inside the aluminum tube , as a matter of fact it is the best place for the coax , better then taping it to the out side of the mast. What does not go inside the mast or close to any metal would be the flat twin lead antenna wire , but then the flat antenna wire should not be used anymore anyway. To provide real and actual help with your reception situation you can do what the other question askers do and -->do this -->
http://forum.tvfool.com/showthread.php?t=4 , post the radar report , use the actual address for the radar report , and the height you are mounting the antenna from the ground up.