May I know what is the reason if the decoder show signal quality = 0 but signal strength = 90%? Cannot get the signal even I try use indoor antenna and outdoor antenna. It is possible area cannot receive the signal? I check in the myfreeview website it does has coverage in Butterworth.

The decoder is from Shopee :https://shopee.com.my/MCMC-Approved-TVBox-Astro-Full-HD-1080P-HDTV-Decoder-TV-Decoder-Terrestrial-Receiver-TV-Box-Astro-Antenna-Compatible-i.141014052.2667290356

In this case, how can I know is the antenna issue or the area is lack of signal?
I use dvb t2 box and TV with build in tuner still the same.