diff --git a/antennas_briefly/main.md b/antennas_briefly/main.md
index bc00fdb..a8e2c7d 100644
--- a/antennas_briefly/main.md
+++ b/antennas_briefly/main.md
@@ -58,3 +58,13 @@ date: Nov 21, 2022
 ## Polarizace dipólové antény (Yagi)
 
 ![Yagi polarization](pic/dipol.jpg){ width=75% }
+
+## Výroba antény
+
+- frekvence
+- dosah
+- šířka pásma
+
+## Zajímavé signály kolem nás
+
+- DCF77
diff --git a/antennas_briefly/main.pdf b/antennas_briefly/main.pdf
index 953a579..83e75ac 100644
Binary files a/antennas_briefly/main.pdf and b/antennas_briefly/main.pdf differ