Another good source of antenna masts is readily available EMT Conduit from your neighborhood building supply outlet.
In this video, Darren (N4VFR) shows us how he mounted a 2m/440cm J-Pole Antenna on a few lengths of EMT Conduit.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=vSHr8k07PdQ.
Here are a few comments from Darren (N4VFR):
Using EMT Conduit that I bought from the local home improvement for my 2m/440cm Jpole antenna.
10' EMT Conduit 1 1/2"
10' EMT Conduit 1 1/4"
~~~~~ Video Contents ~~~~~
00:00 Intro
02:32 Mast assembled
03:47 Black Jpole 2m/440cm Antenna
04:16 Mounting the Jpole to the Mast
04:54 Mounting the Mast into the 4' pipe.
06:05 Burying coax cable
06:50 Outro
Music: http://www.bensound.com/royalty-free-...#HamRadio#Antenna#AntennaMast