1)
What is "Im Alon Mutzav"?
1.
Radak: It is close to Alon, like "Hemah Im Beis Michah
1
" (18:3).
1
Our text of Radak says 'Beis Lechem'; this is a printing mistake. (PF)
2)
Why does it say "Im Alon Mutzav"?
1.
Rashi citing Targum Yonasan: It is the plain in which there were Matzevos
1
. Radak - a stone or something else was Mutzav (set up) there.
1
Matzevah can mean a monument by a grave, or an altar of one stone, which the Torah forbids. It seems that Rashi refers to the former. (PF)