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).
Smart TVs have been popular for many decades.
"most of them" (lines 2 and 3) and the majority of them are synonymous expressions.
The variety of TV programs was much greater after the 1970s.
Without a wireless adapter, it is not possible to connect a Smart TV to the Internet.
"Although" in "Although they differ" (line 2) can be correctly replaced by though.
"bad" in "reception was sometimes bad" (line 9) is not the contrary of better.