diff --git a/RX_FSK/RX_FSK.ino b/RX_FSK/RX_FSK.ino
index c5b40fb..1dde0c6 100644
--- a/RX_FSK/RX_FSK.ino
+++ b/RX_FSK/RX_FSK.ino
@@ -3120,7 +3120,7 @@ void sondehub_station_update(WiFiClient *client, struct st_sondehub *conf) {
   w += strlen(w);
 
   // Only send email if provided
-  if (conf->email != '\0') {
+  if (strlen(conf->email) != 0) {
     sprintf(w,
           "\"uploader_contact_email\": \"%s\",",
           conf->email);
@@ -3128,7 +3128,7 @@ void sondehub_station_update(WiFiClient *client, struct st_sondehub *conf) {
   }
 
   // Only send antenna if provided
-  if (conf->antenna != '\0') {
+  if (strlen(conf->antenna) != 0) {
     sprintf(w,
           "\"uploader_antenna\": \"%s\",",
           conf->antenna);
@@ -3346,7 +3346,7 @@ void sondehub_send_data(WiFiClient * client, SondeInfo * s, struct st_sondehub *
   }
 
   // Only send antenna if provided
-  if (conf->antenna != '\0') {
+  if (strlen(conf->antenna) != 0) {
     sprintf(w,
           "\"uploader_antenna\": \"%s\",",
           conf->antenna);