[walrus01]

You could design a receive only satellite dish with side shielding, even up to the point of making it technically equivalent to an ETSI class 4 antenna for licensed microwave systems, but it would look considerably different (like a drum with tall walls) and would cost a great deal more.

https://aviatnetworks.com/tag/class-4-antennas/

https://www.commscope.com/blog/2015/the-benefits-of-class-4-...

in general this is a very cost sensitive market if you go to a big city in pakistan, afghanistan or iran and look at the $100 satellite dishes with LNBs all over the roofs.

[syedkarim]

Those are $20 dishes and $3 LNBs. The dishes are just stamped sheet metal. The LNBs are highly integrated; mostly passives and a really cheap RF ICs.

[walrus01]

That is a good point. I was being overly generous by far on the actual dish cost, and including the cost of cabling and a basic receiver set top box. But building a jam resistant rx only dish would still have significant economic challenges.