Unfortunately modifying an FRS radio is illegal. Thats why they come with a fixed/non- removable antenna and they are limited to how much output (i.e. wattage) they can produce. In a SHTF scenario the above point is moot. In reality, a HAM radio license is easy to get and the radios are relatively cheap. Also, the infrastructure is already in place to support them. I studied the book and took the practice tests on qrz.com. Found a local place that gave the test, it took me 6 mins and another 10 mins to fill out the paperwork. 2 weeks later my call sign appeared on the FCC database and I was on my way. Not to mention the fact that HAMS are all over the EMS/Emergency mgmt units nationwide. Lots of free information and learning experiences. Just a thought, hope that helped. Jeff KE5UBQ