Hello and welcome to PSG.
On the original image, use your Polygonal Lasso Tool to make a selection around the antennae.
Hit Command/Control + J to copy the selected antennae to it's own layer.
New antennae layer.
Turn off the new antennae layer.
Add a layer mask to the original layer.
Use your Brush Tool (set to black) to mask out the original antennae.
At this point I would add a new layer filled with white below the original layer.
All that's left to do is to use the Free Transform function to move the new antennae layer.
Select/highlight the new antennae layer.
Hit Command/Control + T to enter free transform.
Move the center pivot point to the base of the antennae.
Place your cursor just outside top right hand corner handle and rotate.
Hit enter to accept the changes.