diff --git a/owlps-listener/owlps-listenerd.c b/owlps-listener/owlps-listenerd.c
index 8876d71..6311f7d 100644
--- a/owlps-listener/owlps-listenerd.c
+++ b/owlps-listener/owlps-listenerd.c
@@ -977,7 +977,6 @@ void read_packet(const struct pcap_pkthdr *pkt_header,
   owl_captured_request request ; // Message to send to the aggregator
   uint16_t rtap_bytes ; // Radiotap header size
   uint_fast16_t offset ; // Offset to read the packet
-  bool antenna_signal_present ; // Is the antenna signal field present?
   uint8_t raw_packet_fc1 ; // First byte of the received frame's FC
   uint8_t raw_packet_fc2 ; // Second byte of the received frame's FC
   // Size of the IEEE 802.11 header:
@@ -1168,7 +1167,9 @@ void read_packet(const struct pcap_pkthdr *pkt_header,
     return ;
 
   /* Radiotap header handling */
-  antenna_signal_present = extract_radiotap_ss(pkt_data, &request) ;
+  if (! extract_radiotap_ss(pkt_data, &request))
+    fprintf(stderr, "Warning! The antenna signal field is absent from"
+            " the radiotap header!\n") ;
 
   /* Display the packet details */
   if (VERBOSE_DISPLAY_CAPTURED)
@@ -1215,7 +1216,7 @@ void read_packet(const struct pcap_pkthdr *pkt_header,
              mobile_ip_str,
              request_time_str,
              capture_time_str,
-             antenna_signal_present ? request.ss_dbm : 0,
+             request.ss_dbm,
              owl_ntohf(request.x_position),
              owl_ntohf(request.y_position),
              owl_ntohf(request.z_position),
@@ -1337,6 +1338,7 @@ bool extract_radiotap_ss(const u_char *pkt_data,
     }
 
   // Antenna signal not extracted
+  request->ss_dbm = 127 ; // maximum, improbable value
   return false ;
 }