I had an interesting install... the guy knew enough to the job and maybe then some.... I chose to have the dish mounted on the roof, over an eave, SW corner of house. I could have used a pole, chose not to that.
I asked the tech, if he had some kind of pitch, black-tar, mastic, tar sealer... you get the idea (hopefully)...
He said, no. I asked if he had some black tape sealer...
"Oh, Bishops Tape.... yeah, I have never used that stuff..."
It had mastic tape on the side of the box and it was NEW.
I get out my straight razor to cut it, never tear the stuff, it will degrade its sealing properties.
He learned a little and now he can ensure that when he drills into a roof with a layer of mastic between the roof and the antenna supports it wont leak.
If you do the install right then you shouldnt have problems...
Mount on siding, I would NEVER EVER NEVER think of that!!!! You created a water entry point, behind that siding is more than likely OSB wood or plywood. With expansion and contraction even the best sealent will degrade and no longer provide protection and you WILL have water damage. Termites love moist dark areas! Good luck... Between the money you saved on the antenna and the cost of a new mobile home you really made out.
Regards,
Tampa Satman