How do you take rf samples from your transmitter. If that the pickup box?I use a 30mhz scope to monitor modulation and do receiver alignments on CB radios. It does everything I need and I can see when a junk amplifier is oscilating. Found it on epay for under $50 shipped. Super glued a broken knob and and it was good enough for me.
I use a bnc connector to mount an RF pickup inside amplifiers, watt meters or whatever I have inline. It makes for one less jumper but you can build a pickup in a small project box.
Some guys wrap a dozen wraps of small gauge wire around their coax for a pick up. It does work but the waveform on the scope didn't look as clean for me.
As for the RX alignment all I use is an 8 ohm ceramic resistor and a bnc connector. For the simple tasks I do I haven't needed to buy any probes.