damn antenna thing

[callum_88]

when i bought my car it didnt have an antenna, in the mean time i got a steel coat hanger, bended it straight, stuck it in and it worked great, then i finally bought a replacement antenna and it has crap signal. but on really hot days when i start my car up it says it has better signal than usual. im stumped, earth was connected properly also.

 

[VSPantha]

When the aerial gets hot it'd be increasing in electrical resistance... which I thought would have lowered the signal quality? Is the new antennae electrically operated (up down) or just a static aerial? Have you checked the actual coax cable going from the head unit to the antennae... make sure the outer shielding hasn't been torn or pinched?