Again by and large an excellent part. As Old_Grey noted the board needs some work on copper0/copper1 and silkscreen, I chose to have a bash at the antenna part.Below is an fzz file with your original antenna and my modified version which consists of the following changes:
pcb.svg: added a copper0 group and silkscreen. Changed the rectangles used as the pads to circles (Fritzing won't drill the hole in a rectangle I don't think, it certainly isn't in this case).
Schematic.svg added a connetor7 terminal (which didn't exist) and moved connector6 terminal up so that it is in the correct position on the end of the pin. Made the containing rectangle a bit bigger and aligned it to the .1 grid lines (not really necessary but neater) ungrouped everything and regrouped it (without the many many groups Inkscape loves to add) and removed most translates. I think one of the translates was causing the grid misalignment.
breadboard.svg was good as is (nice job!). The only visible change is the red dot in the center of the connector, and that is caused by changing the connector type from female to male in the fpz file. Again all svgs were edited to remove the px on font sizes after being edited with Inkscape.
fpz file: added connector6terminal and connector7terminal (both missing) to the schematic connections, changed both connector types from female (used to mark breadboard pins, not to indicate the type of connector!) to male. The results of all of this are visible in the fzz file. To test this (and both parts I make and ones like this that I'm reviewing) I create connectors of the appropriate length (2 in this case) from core and use them to make connections (at an angle) to the new part. This shows up errors such as lack of a terminal definition in schematic (you will note the original part makes the connection to the middle of the pin, which is the default it there isn't a terminal correctly defined). The new part connects to the end of the pin as is desirable. The part is also aligned to the .1 grid where the original is offset by about .05 in from the grid. In pcb view you see that I can make connections on both sides of the board to my part, but only on one layer (due to no copper0) on the original. More importantly if you create a gerber file from the pcb by selecting
file->export->for production => extended gerber and view the gerber with a gerber viewer such as gerbv, you will find while the square pad appears in one copper layer, there isn't a drill hole in the pad (I assume because it isn't the required circle for Fritzing to calculate the hole size). The new part has the needed holes. From the fzz file below you can export a copy of my modified part from the temp bin by right clicking it and selecting export part to get a copy of the files to see that changes. Feel free to ask about anything that is unclear, as we would like to encourage everybody to make more parts 
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RDM6300-ANT.fzz (17.6 KB)
Peter