Thanks for the suggestion...I invoke tcpdump as follows.

sudo tcpdump -e -l -i mon0 ether src 00:19:d2:b9:7d:6e

Also, I used airmon-ng to place my interface into monitor mode. The output of tcpdump looks like this...

22:15:51.028806 122199043083us tsft short preamble 11.0 Mb/s 2437 MHz 
+(0x00a0) -34dB signal -95dB noise antenna 1 [0x0000000e] CF +QoS BSSI
+D:00:1b:63:2b:31:59 (oui Unknown) SA:00:19:d2:b9:7d:6e (oui Unknown) 
+DA:00:16:cf:91:cb:9f (oui Unknown) Data IV: d0 Pad 20 KeyID 0

22:15:51.029580 122199043849us tsft 18.0 Mb/s 2437 MHz (0x00c0) -77dB 
+signal -95dB noise antenna 1 [0x0000000e] DA:00:16:cf:91:cb:9f (oui U
+nknown) BSSID:00:1b:63:2b:31:59 (oui Unknown) SA:00:19:d2:b9:7d:6e (o
+ui Unknown) Data IV:3c51 Pad 20 KeyID 0
[download]

The two lines are the same ping captured twice. 1 from the AP and one from the host. You can see the difference in signal level. Does that clarify things?