I got all the stuff needed to mount it (i.e u bolts etc) with the actual weather station, so i had everything (bar a rather large pole) to mount it straight away.
With setting mine up i was quite lucky becuase previously there was an airband radio mast (not that large) on my roof which attached to 2 u bolts, luckely for me the pole went into the 2 bolts and it was very easy to install. Although i did have to climb up onto the top roof, from which had quite a hard frost on :o :o :o , not usually scared of heights but it really put the s**t up me ..