1. Do check the aerial direct into one TV seems OK. Also check and fettle the cables and connections.
2. That Labgear brand Remotelink amp is only 8dB gain so doesn't do much more than make up for the splitting of signal to multiple outlets and the cable losses, so seriously doubt you are in a poor signal area.
3. If no magic eye (remote control return to a $ky box for example) is involved a simpler amp will do the same job.
4. If only two outlets needed, a 2-way 8dB gain distribution amp may be cheaper.
5. Similarly if no VHF/DAB aerial input needed a simpler UHF only amp could suffice.
One with around 8dB gain to match what was working should do the job OK...
Proception is a good brand recommended by ATV aerials owner Justin.