import pandas as pd

df = pd.read_excel(r'D:\ATT\ATT_GPD_ALL.xlsx', dtype=str)
lookup = {}
for _, row in df.iterrows():
    tx = str(row['tx_call_sign']).strip()
    rx = str(row['rx_call_sign']).strip()
    lookup[(tx, rx)] = row['RxBearing_deg']

print("(WQTJ925, WLN555):", lookup.get(('WQTJ925', 'WLN555')))
print("(WLN555, WQTJ925):", lookup.get(('WLN555', 'WQTJ925')))