There is another aspect to propagation on 160 during daylight hours. In the
broadcast field it is not uncommon to experience periods of "skywave"
propagation during daytime hours, especially during the winter months. That
is why
the FCC and the Canadian DOC have incorporated a "critical hours" period
(it's called the "transitional period" in the Canadian Broadcast Rules and
pertinent bilateral treaties) into the AM Broadcast Rules. It is defined as
the
period of time that occurs two hours after local sunrise and two hours before
local sunset. It is possible to hear broadcast stations from hundreds of
miles/kilometers away during daylight hours. I have even heard broadcast
stations hundreds of miles/kilometers with a sensitive receiver during mid day
at
certain times of the year.
It is true that there is a greater number of stations on topband than there
were years ago and there are better receivers and receiving antennas which
also add to this phenomenon, as has already been mentioned.
73.........de Goose, W8AV
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