i usually just lick my 2 fingers "thumb and index" and tightly pull it through my fingers making it as straight as possible,then push it through the tube. usually it feeds rite through.
My secret i got all my friends doing is using a pice of fishing line. Not no damn 20 pound test just some 4 pound will do nicely. Thread it through and tie it to the atenna and pull it threw. Bam you done. And if your a fishing fool like me you have boxes of line laying around this is a great use for it. And I'm shure a 300yard spool for 5$ is alot cheaper than wire.