If your Rx is ch 36 which is 72.51 Mhz, then your Rx is hi band.

If you bought the radio new and have not diddled with the crystals then you can be assured it is a high band. If you bought it used there is always the possibility that someone had diddled with the crystals. Assuming that the Rx functions with the Tx you can confirm the ch by popping the crystal and holder out from the back of the Tx and read the Frequency right on the crystal or it is usually on the holder as well, reinstall it. It cannot be put in backwards there is no polarity with crystals.

John