Adding detail to wire dipole example.

docs/source/examples_advanced.rst

@@ -1,6 +1,6 @@
-********
-Advanced
-********
+**************
+Advanced usage
+**************
 
 This section provides example models of some of the more advanced features of gprMax. Each example comes with an input file which you can download and run.
 

docs/source/examples_antennas.rst

@@ -9,13 +9,18 @@ Wire dipole antenna model
 
 :download:`antenna_wire_dipole_fs.in <../../user_models/antenna_wire_dipole_fs.in>`
 
-This example demonstrates a model of a half-wavelength wire dipole antenna in free space.
+This example demonstrates a model of a half-wavelength wire dipole antenna in free space. The length of the dipole is 136mm with a diameter of 6mm, and a 1mm gap between the arms.
 
 .. literalinclude:: ../../user_models/antenna_wire_dipole_fs.in
     :language: none
     :linenos:
 
-**Details and results to add**
+.. figure:: images/antenna_wire_dipole.png
+    :width: 600 px
+
+    FDTD geometry mesh showing a wire dipole antenna model.
+
+The antenna is fed using the ``#tranmission_line`` command. The one-dimensional transmission line model virtually attaches to the dipole at the gap between the arms. The antenna has an input impedance :math:`Z_0` of 73 ohms specified in the ``#tranmission_line`` command. The transmission line uses a Gaussian waveform with a centre frequency of 1.5~GHz.
 
 
 Bowtie antenna model

docs/source/examples_simple_2D.rst

@@ -1,6 +1,6 @@
-********
-Basic 2D
-********
+*********************
+Introductary/basic 2D
+*********************
 
 This section provides some general example models in 2D that demonstrate how to use certain features of gprMax. Each example comes with an input file which you can download and run.
 

user_models/antenna_wire_dipole_fs.in

@@ -6,13 +6,10 @@
 #waveform: gaussian 1 1.5e9 mypulse
 #transmission_line: z 0.025 0.025 0.100 73 mypulse
 
-## 136mm length
+## 136mm length, 6mm diameter cylindrical dipole
 #cylinder: 0.025 0.025 0.032 0.025 0.025 0.168 0.003 pec
+
+## 1mm gap at centre of dipole
 #cylinder: 0.025 0.025 0.100 0.025 0.025 0.101 0.003 free_space
 
-geometry_view: 0 0 0 0.050 0.050 0.200 0.001 0.001 0.001 antenna_wire_dipole_fs n
-
-python:
-for i in range(1, 61):
-    print('#snapshot: 0 0 0 0.049 0.049 0.199 0.001 0.001 0.001 {} snapshot{}'.format((i/10)*1e-9, i))
-end_python:
+#geometry_view: 0 0 0 0.050 0.050 0.200 0.001 0.001 0.001 antenna_wire_dipole_fs n