“bad" in “reception was sometimes bad" (line 9) is not the contrary of better.
“Although" in “Although they differ" (line 2) can be correctly replaced by though.
“everybody" in “everybody could record" (line 13) and somebody are synonyms.
Some decades ago, watching TV depended on different factors, including the weather.
In the 1970s, it was only possible to watch local TV programs.
A little is considered a correct alternative for “a few" in “a few channels" (lines 7 and 8).
“most of them" (lines 2 and 3) and the majority of them are synonymous expressions.
Smart TVs have been popular for many decades.
Without a wireless adapter, it is not possible to connect a Smart TV to the Internet.
The variety of TV programs was much greater after the 1970s.