Updated Antennas (markdown)

Antennas.md

@@ -1,7 +1,26 @@
-This application gives you a reference of the optimal length of the antenna for an specific frequency response. 
+This application calculates the optimal antenna length for any specific frequency you may input, displaying the result in both **Metric** and **Imperial** units. 
 
-# Types of antenna
-Any antenna can be plugged to the HackRF, however there is a bunch of typical ones, broadly available for the HackRF:
+You can also change the wave type from a preset list of divisors including full, half, quarter waves (and other divisors) which is handy for choosing an appropriate antenna (if not the best one -a.k.a full wave one-).
+
+**NEWBIE NOTE**: The need for selecting the right, ("tuned" or "matched") antenna for each frequency is of paramount importance, otherwise the RX or TX will be less than optimal, and under some circumstances (such as grossly mismatched antenna under high power TX) could you may end up damaging your equipment.
+
+## Adding your own antennas
+
+This Antenna calculator app goes a step further and also tells you how much you should extend any pre-defined telescopic antenna you may own, which is of great help while doing some field work and having to resource to whatever Antennas you included on your kit.
+
+For this to work, you will need a microSD card inserted on your Portapack. A simple text file with the antennas you use needs to be present under /WHIPCALC/ANTENNAS.TXT
+
+### ANTENNAS.TXT example
+
+```
+#antenna label,elements length in mm, separated by a commas
+ANT700,95,134,175,206,230,245
+ANT500,185,315,450,586,724,862
+TELESCOPIC,118,183,253,326,399,476
+Cheap 11cm,118,183,253,326,399,476
+```
+
+The txt file syntax is self-explanatory with the included comment on top of it.
 
 ## Telescopic
 * ANT500