a 1.50 offset dish with 2 lnb
I'm not going to be much help here, but if you
do go with this option you would need to determine ahead of time if you can, in fact, install 2 LNB's on the same dish
for satellites that are 4 degrees apart (107.3 & 111.1). On the 90cm dish I once used, the LNB's were physically too large to place two of them close enough to receive satellites that are 4 degrees apart. Perhaps with a 1.5m dish this would not be an issue, but I'm not sure how you would make that determination short of contacting the manufacturer or vendor. The feasibility of using 2 LNBs on the same dish depends on the contour of your dish and its focal length.
I have read of instances where people have removed the plastic case from each LNB, thereby reducing their size, in order to be able to mount them close enough for 4 degree spacing, and then fashioning a bracket to hold them.
You may see advertisements for LNBs that will handle 4-degree spacing. I have been made aware that these LNBs work
only with dishes made by the same manufacturer, so beware before you buy.
It would seem to me that the 2-dish option w/switch is less hassle, albeit more expensive.
Is it difficult the installation by myself if i haven´ t make this before
Other posters in your area are having success doing it themselves with help from people on this forum. I guess it depends on you patience level.
Or should i pay more for professional installers
You might want to investigate the existence of
competent installers in your area who have experience with Shaw Direct. Those who have no such experience, and who do not read this forum, could cost you a lot of money while they learn at your expense......