Cable Weak signal

H1 box been working fine, receiving all channels, but the last couple of weeks SP 1 HD has been breaking up and a couple of others with no picture. The signal has always been about 9-20 on those channels,but still getting a good picture, now there showing 0 signal. Ive checked the cables etc.Is there anything that can boost the signal. The was an antenuator on which ive taking off now.
 
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