Update for 11-11-21 16:45

tech/Antenna.wiki

@@ -0,0 +1,18 @@
+= Antenna =
+
+An antenna is some type of conductor, used to propogate radio signals. This is
+done because an electric current in metal induces an electromagnetic field.
+This can be transmitted and recieved by an antenna. When the antenna recieves
+the signal, an electric current is induced in the antenna due to the
+intersection of the electromagnetic radiation in a conductor.
+
+*Polarization* is what orientation the electric field is from an antenna. This
+is the same orientation as the conductor of the antenna. To get the best
+signal, the sending and recieving signals must be of the same polarization.
+
+Due to how signals propagate through the atmostphere, their polarization
+changes dramaticly, and therefore it often doesnt matter what oerientation an
+antenna has when working with signals that propogate often (such as HF, see
+[[frequency_range]]). This phenomenon is called eliptical polarization.
+
+

tech/Ham.wiki

@@ -34,3 +34,4 @@ see [[electronics]]
 == Signals ==
 
 [[Propagation]]
+[[Antenna]]

tech/Propagation.wiki

@@ -36,3 +36,9 @@ Note
 * E skip of E,,s,, happens most duirng early summer and mid winter 
   - 10, 6, and 2 meters only
   - This is what makes HF so good at long distance comms
+* F1 and F2 combine at night, due to not being as charged
+
+Different parts of the ionosphere are charged at different times of the day,
+making it so comms one way but not another are possible, and making it so that
+ability to talk is limited by seasons, weather, and the sun cycle.
+