I'm sure I'll be corrected if I'm wrong, but Radio Shack dosen't make a scanner that can receive 700Mhz frequencies. This leaves large chunks of the DTRS un-monitorable (is that a word?) especially in the metro area and out east when using Radio Shack products...
At last word, Radio Shack dosen't even have a design on the drawing board for 700Mhz...