Whenever a cable signal is split between two or more TVs or routed to some other video components such as VCRs, the signal weakens and produces a poor quality picture. Since most cable viewers use several different video components, it is recommended that an amplifier be used to restore the signal strength and the picture sharpness. Consider using a 10db Amplifier to improve signal strength. When your company doesn't carry your brand then you need to find out if they either have in stock or have a source for your uncommon make and model. Usually the source has another outlet or may need to do research on your request.
Bullets are nothing more than transmitted signal which effects the cable box program.
It does not fry the guts of the equipment but rather may shut the box off temporarily, reprogram the box, or shut the box down in an error mode till service can rectify the problem. A non-addressable box with the appropriate filters will manage this process effectively. The brand name is located on the front of the box. From this you can determine what you will need or consult in conjunction with your cable box source for the right replacement. The picture rolls and displays a wiggly white line running down the left, right or both sides of the screen.