I have a couple of surge protector strips which were fairly cheap. They
do not protect from brownouts.

Consider the repair costs for what you are protecting. If you are
protecting $1000 + worth of equipment then $100 for a good device is a
worthwhile investment.

Also consider the number of brownouts and outages you may experiance.

Protection against lightning strikes should be considered on any
antenna cabling as well as the power wiring.