Can’t help you with the card and your receiver, but here are a couple of suggestions on placing the caches.
1. When you plug in your zip code and get a list of caches in that area, look at the top of the page and find “search for caches with Google maps”. Click on that and you will see on a map where there are already caches. Zoom in to areas you are thinking of placing a cache. If nothing is shown there, you are usually OK with the placement as far as the distance goes.
2. When you are working on a cache write-up, uncheck the box on the page that says “Yes, this is cache is currently active” before the initial submission. After it is submitted and you get a cache GC number, you can then look at the cache page, go down near the bottom, and search for nearby caches. That will relocate your search to the coordinates of the cache you are working on. If the nearby caches are all over 0.1 miles away, your cache should be OK for distance.
On #2, you can go back and edit the cache page all you want. When you are ready to submit for review, recheck the “currently active” box and the reviewers will see the cache and decide if it meets the criteria for placement. Your distance should be OK, and hopefully everything else gets the “good to go”.
Good luck, and keep coming back to the forums for help!