Then make this 50 cent “coax only, without connector” Spider, which I used for experiment linked below.
Why Antennas Have Ground Plane?
Note:
(1) Use 8 radials instead of 4 radials to improve performance.
(2) For outdoor use, around the area where radials are inserted into outer plastic cover of coax, apply few drops of a sealant (such as 2-part epoxy, or silicone sealant, or hot melt glue).