You are the famous detective, Sherlock Holmes. You need to use your cell phone, which broadcasts an 800 MHz signal, to call your colleague Watson. However, you are due south of two massive radio-wave absorbing buildings that have only a 15 meter gap between them. You left Watson doing surveillance on a suspect, 2 km north and 1.5 km west of your location near the buildings. You do a quick calculation (in your head, of course) to determine whether the cellular signal reaching Watson will be strong.